f(x) = x³ (a) Complete the following table.
- (a)Complete the following table. X | -3 | -2 | -1 | 0 | 1 | 2 | 3 f(x)| | | | | | |[1]
- (b)Using a scale of 2 cm to represent 1 unit, draw a horizontal x-axis for −3 ≤ x ≤ 3. Using a scale of 2 cm to represent 10 units, draw a vertical y-axis for −30 ≤ y ≤ 30. Using your axes, plot the points in the table and join them with a smooth curve.[2]
- (c)(i)Use your graph to solve f(x) = -15.[1]
- (c)(ii)Use your graph to find a such that f¯¹ (a) = 1.7 .[1]
- (c)(iii)Given that f¯¹(t) = u, express t in terms of u.[1]
- (c)(iv)By drawing a tangent to y = f(x), estimate the gradient of the curve when x = 2.[2]
- (d)(i)Using the same axes draw the line that represents the function g(x) = 5x + 3 .[2]
- (d)(ii)Hence find the three solutions of the equation f(x) = g(x) .[2]
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Mark scheme
Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.
- [1] -27 -8 -1 0 1 8 27
- [2] 7 correct plots and smooth curve; B1 for 5 plots
- [1] -2.4 to -2.6
- [1] 4 to 6
- [1] t = u³
- [2] 10 to 13; M1 for a tangent at x = 2
- [2] Correct line; B1 for correct intercept (0, 3) or gradient 5
- [2] (-1.95 to -1.7); (-0.8 to -0.5); (2.4 to 2.6); B1 for one correct
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