2 x square - 17 x minus 30 factories it
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2x^2 - 17x - 30
2x^2 - ( 20 - 3 ) x - 30
2x^2 - 20x + 3x - 30
2x (x - 10) + 3(x - 10)
(2x + 3) (x - 10)
x = -3/2 , x = 10
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