5(20-25)-5(4x-25)+x(5x-25)
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refer to the attachment
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=5(20-25) -5(4×-25) +x(5x-25)
=100-125-20x+125+5x^2-25x
=5x^2-45x+100
=x^2-9x+20
=x^2-5x-4x+20
=x(x-5) -4(x-5)
=(x-5)(x-4)
=x=5 or x=4
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