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

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Answer 1 · 2018-06-20T19:48:32

$f(-3)=-72$

$"to evaluate "f(-3)" substitute "x=-3" into "f(x)$

$f(color(red)(-3))=-8xx(color(red)(-3))^2=-8xx9=-72$

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