14. If f(x) = x + 7 and g(x) = x - 7, find (fog)(7).
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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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