Question

I need help with the problem shown at http://pbckt.com/pK.uZmWLJ

Answer 1

sub them in?

Answer 2

I got 80?

Answer 3

so whats the problem?

Answer 4

Is that right?

Answer 5

servet?

Answer 6

@ghazi

Answer 7

-5x^2y put x=4 and y=-1
-5(4)^2*(-1)=-5*16*-1=80

Answer 8

\[-5(4)^2(-1)=-5*16*-1=80\]