Question
If f(x) = x + 7 and g(x) = x - 7, x ∈ R, write fog (7).
✓
Answer
(fog)(7) = f(g(7))
= f(7 - 7)
= f(0)
= 0 + 7
= 7
= f(7 - 7)
= f(0)
= 0 + 7
= 7
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