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x^2-12x+36=90 x^2-12x-64=0 factor: (x-16)(x+4)=0 by the zero product theorem, x-16=0 or x+4=0 => x=16 or x=-4
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x^2-12x+36=90 x^2-12x-64=0 factor: (x-16)(x+4)=0 by the zero product theorem, x-16=0 or x+4=0 => x=16 or x=-4