5x + 16 = (5x + 4)^25x + 16 = 25x^2 + 40x + 160 = 25x^2 + 40x + 16 - 5x - 160 = 25x^2 + 35x0 = 5x(5x + 7)x = 0 or x = -7/5
5x + 16 = (5x + 4)^2
5x + 16 = 25x^2 + 40x + 16
0 = 25x^2 + 40x + 16 - 5x - 16
0 = 25x^2 + 35x
0 = 5x(5x + 7)
x = 0 or x = -7/5