Expand Your answer should be a polynomial in standard form.
(-r^2+ 3r– 7)(r^2– 7) =
PLEASE HELP !!

-r^4+3r^3-21r+49

Step-by-step explanation:

(−r2+3r+−7)(r2+−7)

=(−r^2)(r^2)+(−r^2)(−7)+(3r)(r^2)+(3r)(−7)+(−7)(r^2)+(−7)(−7)

=−r4+7r2+3r3−21r−7r2+49

=−r4+3r3−21r+49

$8

step-by-step explanation:

it is pretty much backwards.

you take the 4x2 multiply that, and that is = $8