x2 - 7x = 8 x2 - 7x - 8 = 0
Now find two numbers that multiply to equal -8, and add to equal -7.
(1) * (-8) = -8
(1) + (-8) = -7
(x+1)(x-8) = 0 This is the factored form of x2 - 7x = 8
You can then solve the equation if necessary, and get:
x = -1 or x = +8
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If you mean: x2+6x+8 then it is (x+4)(x+2) when factored
"(x - 5)(x - 2)"
(x - 8)(x - 6)
x2-2x-15 = (x+3)(x-5) when factored
It is: (x+4)(x-2) when factored