A-level Maths · Algebra and functions

Value of a composite function

Find fg(a) or gf(a) for two functions: work out the inner function first, then the outer.

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Question 1

The functions ff and gg are defined by f(x)=3x2+6f(x) = 3x^{2} + 6 and g(x)=4x−6g(x) = 4x - 6. Find the exact value of fg(−1)fg(-1).

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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