# math

posted by
**Becks**
.

Simplify and show:

2a-6(10a)-5a^2(2)

-----------------

(2a-6)^2

This is my work but its not right.

10a-10a^2

--------

2a-6

Then solve for a by setting numerator to zero. so I got this...

10a-10a^2=0

10a(1-a)=0

a=0, a=1

My book says a=0, or a=6 why didn't I get this?