Answer:
5x + 11
Explanation:
note that (f - g)(x) = f(x) - g(x)
f(x) - g(x)
= x + 8 - (- 4x - 3) ← distribute parenthesis by - 1
= x + 8 + 4x + 3 ← collect like terms
= 5x + 11
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