Answer:
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Step-by-step explanation:
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X > 9
2x > 18
x > 18/2
x > 9
Hope this helps :)
D
(f - g)(x) = f(x) - g(x), so
f(x) - g(x)
= 3x + 1 - (x² - 6) ← distribute by - 1
= 3x + 1 - x² + 6 ← collect like terms
= - x² + 3x + 7 → D