There is a formula for the "difference of squares." In this case, the answer is
(5x + 3)(5x - 3)
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x^2 +9 =x^2 -9 9=-9 No solution
Find factors of -99 which sum to -2. Solution appears to be 9 and -11 (x + 9)(x - 11)
(z-9)(z+3
(9 - 5u)(9 + 5u)
(7x + 8)(7x - 9)