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x(a-b)=ax-bx x2-1+y2=(x-1)(x+1)+y2 x2-1=(x+1)(x-1) ax+bx+c=x(a+b)+c
x(x-1)=x2-1 x2-x=x(x+1) x2+x=x(x+1) x2-x=(x+1)(x-1)
x2﹣5x+6=x(x﹣5)+6 x2﹣5x+6=(x﹣2)(x﹣3) (x﹣2)(x﹣3)=x2﹣5x+6 x2﹣5x+6=(x+2)(x+3)
(x-1)(x-2)=x2-3x+2 x2-3x+2=(x-1)(x-2) x2+4x+4=x(x一4)+4 x2+y2=(x+y)(x―y)
a2+4a﹣21=a(a+4)﹣21 a2+4a﹣21=(a﹣3)(a+7) (a﹣3)(a+7)=a2+4a﹣21 a2+4a﹣21=(a+2)2﹣25
x2-5x+6=x(x-5)+6 x2-5x+6=(x-2)(x-3) (x-2)(x-3)=x2-5x+6 x2-5x+6=(x+2)(x+3)
a2+4a-21=a(a+4)-21 a2+4a-21=(a-3)(a+7) (a-3)(a+7)=a2+4a-21 a2+4a-21=(a+2)2-25
(x-1)(x-2)=x2-3x+2 x2-3x+2=(x-1)(x-2) x2+4x+4=x(x一4)+4 x2+y2=(x+y)(x―y)