Explanation:
f + g and f - g are very simple concepts.
(f+g)(x) = f(x) + g(x)
and
(f-g)(x) = f(x) - g(x)
and so. ..
(f-g)(x) = 2x³ + 7x² - 4x - 5 - 3x - -2 = 2x³ + 7x² - 7x - 3
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