(x+6)(x-6)
(x+2)(x-2)
(x+3)(x-3)
(x+9)(x-9)
(x+10)(x-10)
(x+25)(x-25)
(x+1)(x-1)
(x+5)(x-5)
x^2-36
x^2 - 25
x^2 - 1
x^2 - 81
x^2 - 9
x^2 - 625
x^2 - 4
x^2 - 100
