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O-LevelMathematicsAlgebra and graphs4024/21 · May/June 2015 · Q912 Marks

f(x) = x³ (a) Complete the following table.

  1. (a)Complete the following table. X | -3 | -2 | -1 | 0 | 1 | 2 | 3 f(x)| | | | | | |[1]
  2. (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]
  3. (c)(i)Use your graph to solve f(x) = -15.[1]
  4. (c)(ii)Use your graph to find a such that f¯¹ (a) = 1.7 .[1]
  5. (c)(iii)Given that f¯¹(t) = u, express t in terms of u.[1]
  6. (c)(iv)By drawing a tangent to y = f(x), estimate the gradient of the curve when x = 2.[2]
  7. (d)(i)Using the same axes draw the line that represents the function g(x) = 5x + 3 .[2]
  8. (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. [1] -27 -8 -1 0 1 8 27
  2. [2] 7 correct plots and smooth curve; B1 for 5 plots
  3. [1] -2.4 to -2.6
  4. [1] 4 to 6
  5. [1] t = u³
  6. [2] 10 to 13; M1 for a tangent at x = 2
  7. [2] Correct line; B1 for correct intercept (0, 3) or gradient 5
  8. [2] (-1.95 to -1.7); (-0.8 to -0.5); (2.4 to 2.6); B1 for one correct

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About this question

Topic
Algebra and graphs, O-Level Mathematics (syllabus 4024). Structured question, 12 marks.
Source
O-Level Mathematics, May/June 2015 Paper 2 Variant 1, question 9.

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