x²-15x+56 by middle term splitting
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x^2 - 15x + 56
= x^2 - 8x -7x+56
= x(x-8)-7(x-8)
= (x-8)(x-7)
= x^2 - 8x -7x+56
= x(x-8)-7(x-8)
= (x-8)(x-7)
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