Factored, that's 5(x2- 20) The solution depends on the value of x.
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(5x - 6)(5x + 6)
(5x - 2)(x - 5)
Factored, that's (x - 6)(5x + 2) x = 6, -2/5
(4+x) (2x-3)
There is a formula for the "difference of squares." In this case, the answer is (5x + 3)(5x - 3)