Question

F(x)=x^2-x-12, find f(x)=-12 *problem b

Answer 1

Plug in -12 for $f(x)$!

$-12=x^{2}-x-12$

Now get the left side equal to zero so you can factor:

$0=x^{2}-x$

Now you can factor out an $x$!

$0=x(x-1)$

So for that to equal zero, $x=0$ or $x=1$!