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x2+16x-17 = (x-1)(x+17) when factored
Assuming you wish to make this equation equal zero, for x2 + 16x + 55 = 0, x = -5.
(x - 15)(x - 1)
to factor (x2-16x+64), you need to find two number whose product is 64 and whose sum is 16. These two numbers are 8 and 8. (x2-16x+64)=(x-8)(x-8)
(x - 7)(x - 9)