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x2+ 1 x2+2x-1 x2+x+1 x2+4x+4
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+1)(x﹣1)=x2﹣1 x2﹣4x+4=x(x﹣4)+4 (x+3)(x﹣4)=x2﹣x﹣12 x4﹣16=(x2+4)(x+2)(x﹣2)
x2﹣1 x2+2x﹣1 x2+x+1 4x2+4x+1
x2+1 x2+2x﹣1 x2+x+1 x2+4x+4
x2+x+1 x2+2x+1 x2+2x﹣1 x2﹣2x﹣1
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
a(x+y)=ax+ay x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+6x=(x+4)(x-4)+6x
x2+x+1 x2+2x-1 x2-1 x2-6x+9
(a+1)(a-1)=a2-1 a2-6a+9=(a-3)2 x2+2x+1=x(x+2x)+1 -18x4y3=-6x2y2·3x2y