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Suppose f(x)=e^(ax)+e^(bx)," where " a n...

Suppose `f(x)=e^(ax)+e^(bx)," where " a ne b,` and that f''(x) -2f'(x)-15f(x)=0 for all x. Then the product ab is

A

15

B

-15

C

10

D

16

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