Question

given the function f(x)=3x^2-2, what is the value of f(-3)?

Answer 1

Just plug in -3, in the function
$f(x) = 3 {x }^{2} - 2$

That is;


$f( - 3) = 3( - 3) {}^{2} - 2$
$f( - 3) = 3(9) - 2$
$f( - 3) = 27 - 2$
$f( - 3) = 25$