College of Admission Tests Multan

Functions

Solve the question of and select the option from the choices A through D/E. Check your Answer and view the explanation.

Question: 2

If f(x) = x2 + 5x and g(x) = 2, what is f(g(4))?
  • 36
  • 2
  • 39
  • 14
  • 4

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Correct Answer: D

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First, you must find what g(4) is. The definition of g(x) tells you that the function is always equal to 2, regardless of what “x” is. Plugging 2 into f(x), we get 22 + 5(2) = 14.