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a function f(x) is defined as f(x)= -8x^2. What is f(-3)?

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All you need to do is substitute -3 in place of the x.

• math -

substitute -3 for every x in f(x) and simplify.

• math -

by now you've probably done it, but watch the "-" signs carefully

f(-3) = -8 * (-3)^2 = -8(9) = -72

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