Mathematics for IGCSE & O level - Functions (Section 2 - No. 39)

If f(x) = x^2 and g(x) = x + 2, what is f(g(x))?

x^2 + 2

(x+2)^2

x^2 + 4x + 4

x^3 + 2x^2

解释

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

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