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x2+ 1 x2+2x-1 x2+x+1 x2+4x+4
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(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
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m(x﹣y)=mx﹣my x2+2x+1=x(x+2)+1 a2+1=a(a+) 15x2﹣3x=3x(5x﹣1)
x2+x+1 x2+2x-1 x2-1 x2-6x+9
(y﹣1)(y+1)=y2﹣1 x2y+xy2﹣1=xy(x+y)﹣1 (x﹣2)(x﹣3)=(3﹣x)(2﹣x) x2﹣4x+4=(x﹣2)2