factorise x²-9x= 112
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x^2-9x=112
=> x^2-9x-112=0
=> x^2-16 x+7x-112=0
=> x(x-16)+7(x-16)=0
=> (x-16)(x+7)=0
x-16=0
=> x=16
x+7=0
=> x= -7
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