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If (f(x)=x-2) and (g(x)=x+2), what is ((f\circ g)(x))?

Answer and explanation

Correct answer: (x)

The direct answer is A, \\(x\\). The composition \\(f\\circ g\\) means apply \\(g\\) first and then apply \\(f\\): \\( (f\\circ g)(x)=f(g(x)) \\). Here \\(g(x)=x+2\\), so replace the input of \\(f\\) by \\(x+2\\). Since \\(f(t)=t-2\\), we get \\(f(x+2)=(x+2)-2=x\\). Thus the two opposite changes cancel. Option A is correct because the final output is \\(x\\). Option B, \\(x+4\\), would result from adding both changes instead of applying the minus sign correctly. Option C, \\(x-4\\), uses the wrong direction or repeats subtraction. Option D, \\(2x\\), incorrectly multiplies the variable; no multiplication by 2 occurs. A common mistake is reversing the order: in a composition, the right-hand function acts first. Memory cue: read \\(f\\circ g\\) from right to left—first \\(g\\), then \\(f\\).

Related tags

CompositionIdentity ResultFunction OperationEasy

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