Question

100-20=80

x(x-5)=x²-5x
x²-5x+x+2x=x²-2x
x²-2x=80
x²-2x-80=0
(x-10)(x+8)=0
x=10 x=-8
This is what i've done so far but i don't know what to do next

Answer 1

Explanation:

x=10x=8

8=10x-8

8=9x

divide both side by 9

x=8 out of 9