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2010-02-18T14:22:14+01:00
(g-h-u)²-u²+(g-h)²=(g-h)²-2(g-h)u+u²-u²+(g-h)²=2(g-h)²-2(g-h)u=
=2(g-h)(g-h-u)

a²-3a-b²+3b=a²-b²-3a+3b=(a-b)(a+b)-3(a-b)=(a-b)(a+b-3)

ja+a²+b²+jb+2a=

(g+h)²-g²+h=g²+2gh+h²-g²+h=2gh+h²+h=h(2g+h+1)

(p+r-t)²+p²-(r-t)²=p²+2p(r-t)+(r-t)²+p²-(r-t)²=2p²+2p(r-t)=2p(p+r-t)

6hr+2hb-3mr-bm=2h(3r+b)-m(3r+b)=(3r+b)(2h-m)

-e²+11e-30=-(e²-11e+30)=-(e²-6e-5e+30)=-[(e(e-6)-5(e-6)]=
=-(e-6)(e-5)=(6-e)(e-5)