8х^2=72х64х^2-9=0помогите!

Question

8х^2=72х

64х^2-9=0
помогите!

Answer 1

1)8x^2-72x=0
8x(x-9)=0
x1=0
x=9

2) 64x^2-9=0
(8x-3)(8x+3)=0
8x=3
x1=3/8
x2=-3/8