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If (f(x)=x+1) and (g(x)=x-1), what is ((g\circ f)(x))?

Answer and explanation

Correct answer: (x)

The direct answer is A, \\(x\\). For \\(g\\circ f\\), the function on the right acts first, so \\( (g\\circ f)(x)=g(f(x)) \\). First calculate \\(f(x)=x+1\\). Now use this result as the input of \\(g\\). Since \\(g(t)=t-1\\), we obtain \\(g(x+1)=(x+1)-1=x\\). The addition of 1 and subtraction of 1 cancel exactly. Option A is correct because the output returns to the original input. Option B, \\(x+2\\), incorrectly adds the two changes. Option C, \\(x-2\\), incorrectly treats both operations as subtraction. Option D, \\(2x\\), assumes multiplication, although neither function multiplies by 2. Always substitute the complete expression, not just part of it. The useful exam cue is: composition is substitution, and the rightmost function is performed first.

Related tags

CompositionInverse PairIdentity ResultEasy

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