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Chord Gradient
approximations to Curve Gradients
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please enter all decimal places given by your
calculator when answering
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Q1)
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The quadratic above is y = 2 x2
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Given that the point A is at x = 1, calculate the chord gradient for various h:
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h
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y(A)
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y(B)
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 1?
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Assume that the point A is at x = 4 instead. Complete the following table:
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h
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y(A)
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y(B)
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 4?
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Work out the chord gradient formula for this
curve:
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Q2)
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The cubic above is y = 3x3
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Given that the point A is at x = 2, calculate the chord gradient for various h:
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h
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y(A)
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y(B)
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 2?
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Assume that the point A is at x = 4 instead. Complete the following table:
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h
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y(A)
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y(B)
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 4?
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Work out the chord gradient formula for this curve:
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As h
becomes smaller, what does the chord gradient become?
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Q3)
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The quadratic above is y = 3 x2 – 6 x + 4
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Given that the point A is at x = 2, calculate the chord gradient for various h:
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h
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y(A)
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y(B)
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 2?
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Assume that the point A is at x = 4 instead. Complete the following table:
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h
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y(A)
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y(B)
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Chord
Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 4?
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Work out the chord gradient formula for this curve:
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As h
becomes smaller, what does the chord gradient become?
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Q4)
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Calculate the chord
gradient formula for the quadratic:
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y = 2 x2 + 8 x – 16
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Chord gradient formula:
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Use the chord gradient formula to complete the
following table:
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Starting at
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x = 3
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calculate the chord gradient for various h:
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h
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what do you think is the curve gradient at x = 3?
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Q5)
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Calculate the chord
gradient formula for the quadratic:
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y = –3
x2 – 4 x + 5
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Chord gradient formula:
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Use the chord gradient formula to complete the
following table:
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Starting at x= -6
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calculate the chord gradient for various h:
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h
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Chord Gradient
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2
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0.5
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0.1
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0.01
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0.001
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What do you think is the curve
gradient at x = – 6?
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Q6)
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Calculate the chord gradient formula for the cubic:
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y = x3 – x2
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Chord gradient formula (enter coefficients):
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x2 +
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x h +
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h2 +
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x +
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h
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Use the chord gradient formula to complete the
following table:
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Starting at
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x = 3
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calculate the chord gradient for various h:
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h
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Chord Gradient
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2
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0.5
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0.1
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0.01
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0.001
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From this evidence, what
do you think is the curve gradient
at x = 3?
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Q7)
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Calculate the chord gradient formula for the cubic:
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y = 4 x3 – 2 x2 + 8 x + 12
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Chord gradient formula (enter coefficients):
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x2 +
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x h +
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h2 +
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x +
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h +
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Use the chord gradient formula to complete the
following table:
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Starting at
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x = 3
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calculate the chord gradient for various h:
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h
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Chord Gradient
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2
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1
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0.5
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0.1
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0.01
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0.001
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From this evidence, what
do you think is the curve gradient
at x = 3?
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