x^2 - 3x = 28
x^2 - 3x - 28 = 0
factor left side. what two numbers add up to -3 and who product is 28: -7 and 4.
(x - 7)(x+ 4) = 0
x -7 = 0 or x + 4 = 0
x = 7 or x = -4
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