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2009-05-16T16:43:07+02:00
X²-8x+16=2x²-x-8x+4;
x²-8x+16=2x²-9x+4;
2x²-x²-9x+8x+4-16=0;
x²-x-12=0;
a=1;b=-1;c=-12;
δ-delta; δ=b²-4ac; δ=(-1)²-4×1×(-12)=1+48=49; √δ=7;
x1=(-b-√δ)/2a; x1=(1-7)/2=-6/2=-3;
x2=(-b+√δ)/2a; x2=(1+7)/2=8/2=4;