x2 + 7x - 8 = (x + 8)(x - 1)
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x2+7x-8 = (x-1(x+8)
x2 - 7x = 8 x2 - 7x - 8 = 0Now 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 = 8You can then solve the equation if necessary, and get:x = -1 or x = +8
7x-5x=8 2x=8 x=4
To solve the equation x^2 + 7x - 80, you would get x = 6.105 and x = -13.105, I believe.
9x-4 = 7x+8 9x-7x = 8+4 2x = 12 x = 6