If f(x) = x + 7 and g(x) = x - 7, x∈R, find ( fog) (7) – InterviewSolution

1.

If f(x) = x + 7 and g(x) = x - 7, x∈R, find ( fog) (7)

Answer»

Given f(x) = x + 7 and g(x) = x - 7, x∈R

fog(x) = f(g(x)) = g(x) + 7 = (x - 7) + 7 = x

=> (fog) (7) = 7

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