(f + g)(x)
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I'm assuming that you meant this:
f (x) = x2 + 3x + 2 and g (x) = x + 1
(f + g)(x) is the same as f(x) + g(x)
(f + g)(x) = x2 + 3x + 2 + x + 1 = x2 + 4x + 3
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