Question 51108
ax^2+8ax = 0
a (x^2+8x) = 0
x^2 + 8x  = 0
x^2 + 8x + 16 = 16
 (x+2)^2 = 16
 x+2     = +or- 16^(1/2)
 
so 
   x+2  = + 4     or  x+2 = -4
     x  = 2       or   x  =  -2