(x - 5)(x + 5)
No.
x(x - 1)
(2x - 3)(3x + 2)
a3x2 - 216x2 factors to x2(a - 6)(a2 + 6a + 36)
6a to the second power minus 8ab + 2a
(-7x + 3)(-7x +3)
(x + 1)(x - 1)
(2x - 1)(x + 4)
x^2(x - 4)(x + 4)
which of the following is a factor of x2 - 5x - 6
2x to the fourth power minus 162 equals -146
Just X to the second power minus nine. You can't subtract nine from x to the second power unless you know what x is.