(x - 7)(x - 7)
x^2 - 14x + 49
(9x + 8)(9x + 8)
81x^2 + 144x + 64
(x + 2)(x + 9)
x^2 + 11x + 18
(x - 4)(x + 4)
x^2 - 16
(8x - 16)(8x - 16)
64x^2 - 256x + 256
(b - 8)(b - 8)
b^2 - 16b + 64
(x + 5)(x - 5)
x^2 - 25
(x + 10)(3x +15)
3x^2 + 45x + 150
(2x + 6)(2x + 6)
4x^2 + 24x + 36
(x - 8)(x + 2)
x^2 - 6x - 16