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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
a(x-y)=ax-ay x2+2x+1=x(x+2)+1 (x+1)(x+3)=x2+4x+3 x3-x=x(x+1)(x-1)
a(x﹣y)=ax﹣ay x2﹣2x+3=x(x﹣2)+3 =x2+3x﹣4 x3﹣2x2+x=x(x﹣1)2
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
a(x﹣y)=ax﹣ay x2+2x+1=x(x+2)+1 x3﹣x=x(x+1)(x﹣1) (x+1)(x+3)=x2+4x+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
a(x﹣y)=ax﹣ay x2+2x+1=x(x+2)+1 (x+1)(x+3)=x2+4x+3 x3﹣x=x(x+1)(x﹣1)
(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)