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Suppose f(x)=e^(ax) + e^(bx), where a!=b...

Suppose `f(x)=e^(ax) + e^(bx)`, where `a!=b`, and that `fprimeprime(x)-2fprime(x)-15f(x)=0` for all `x`. Then the value of `ab` is equal to:

A

15

B

-15

C

10

D

16

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