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