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3 marksComposition of Functions

CSEC Mathematics · May/June 2014 · Paper 2 · Question 9(a)(ii)

Two functions are defined as follows: g(x) = 4x + 3; f(x) = (2x + 7) / (x + 1)

Calculate the value of gf(5).

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Other parts of this question

  1. 9(a)(i)State the value of x for which f(x) is undefined.[1 mark]
  2. 9(a)(iii)Find f⁻¹(x).[3 marks]
  3. 9(b)(i)Using 2 cm to represent 1 second on the x-axis and 1 cm to represent 10 metres on the y-axis, plot a graph to show the height of the ball during the first 6…[4 marks]
  4. 9(b)(ii)a)the average speed of the ball during the first 2 seconds[2 marks]
  5. 9(b)(ii)b)the speed of the ball when t = 3 seconds.[2 marks]

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