Question

Would appreciate the help!

Answer 1

Two segments  that are tangent to a circle from the same external point are of equal length.
9)   2x²=8x
2x²-8x=0
x(2x-8)=0
x=0,
2x-8=0
x=4  can be
2*4²=8*4=32

10)  y=y²/7
y²/7- y=0
y(y/7 -1)=0
y=0,
y/7 - 1=0
y/7=1 
y=7 can be
y=y²/7= 7