Posted by **Yania** on Saturday, April 6, 2013 at 6:11pm.

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

- math -
**Leo**, Saturday, April 6, 2013 at 6:37pm
All you need to do is substitute -3 in place of the x.

- math -
**Ollie**, Saturday, April 6, 2013 at 6:39pm
substitute -3 for every x in f(x) and simplify.

- math -
**Steve**, Sunday, April 7, 2013 at 6:21am
by now you've probably done it, but watch the "-" signs carefully

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

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