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A) x^2+(-10-12) x+(-10) ×12=x^2-22x-120
B) m^2+(-3-7) M+(-3) ×(-7) =m^2-10m+21
C) x^2+(1/3-7/3) x+1/3× (-7/3) =x^2-2x-7/9
D) (2x)^2-(5y)^2=4x^2-25y^2
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ok i'll expand it don't worry ..........................................
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