Answer:
5x² - x - 3
Explanation:
note that (f - g)(x) = f(x) - g(x)
f(x) - g(x)
= 5x² - 2 - (x + 1) ← distribute
= 5x² - 2 - x - 1 ← collect like terms
= 5x² - x - 3
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