How do you solve 4x(x−18)=−288?
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4x(x-18)= -288
=> 4x² - 72 x + 288 = 0
=> x² - 18 x + 72 =0
=> x² - 12x - 6x + 72 =0
=> x ( x - 12 ) - 6 ( x - 12 ) = 0
=> ( x - 12 ) ( x - 6 ) = 0
=> x = 12 , 6
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