The square of x plus 10x plus 16 equals 0

The square of x plus 10x plus 16 equals 0

X2 + 10x + 16 = x2 + 10x + 25-9 = (x + 5) square-9 = 0
So, (x + 5) square = 9
X + 5 = 3 or - 3
X = - 2 or - 8