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If (f(x)=x+4) and (g(x)=x-4), what is ((g\circ f)(x))?

Answer and explanation

Correct answer: (x)

The direct answer is A, \\(x\\). The notation \\(g\\circ f\\) means \\(g(f(x))\\), so apply \\(f\\) first. We have \\(f(x)=x+4\\). Put this complete expression into \\(g(t)=t-4\\): \\(g(x+4)=(x+4)-4=x\\). The positive shift of 4 and the negative shift of 4 cancel. Option A is correct because the final value is exactly \\(x\\). Option B, \\(x+8\\), wrongly adds the shifts, instead of noticing that the second shift is negative. Option C, \\(x-8\\), wrongly subtracts 4 twice. Option D, \\(2x\\), introduces multiplication that is not present in either definition. The order is important even though these particular opposite shifts cancel; in other examples changing the order may change the answer. Remember: for \\(g\\circ f\\), start with \\(f\\), then substitute into \\(g\\).

Related tags

CompositionInverse FunctionsIdentity Result

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