Can the Property of this:

Question

ax2 + bx + c = 0
(a+b)(a-b) = 0
a = -b , a = b

BE FURTHER APPLIED TO THIS.....:?

ax2 + bx + 8 = 0
-------------------------
-8 -8
x (ax + b) = 8
x = 8 , x = (8-b)/a

Thank you!