Mathematics for IGCSE & O level - Functions (Section 4 - No. 16)

Given f(x)=x+1 and g(x)=x^2, which expression is correct?

f(g(x))=x^2+1

g(f(x))=x^2+1

f(g(x))=x^2+2x+1

g(f(x))=x^2+2x+1

解释

Correct form of composite function

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