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in Limit, continuity and differentiability by (52.5k points)

Suppose f(x) = eax+ ebx, where a  b, and that f"(x) - 2f'(x) - 15 f(x) = 0 for all x. Then the product ab is equal to

(A) 25

(B) 9

(C) - 15

(D) -9 

1 Answer

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Best answer

Answer is (C) - 15

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