(x-4)²+(x-8)²-10=x²-8x+16+x²-16x+64-10=2x²-24x+70=2(x²-12x+35)=2(x-5)(x-7)
x1+x2=12 U x1*x2=35⇒x1=5 U x2=7
(x+1)²+(x-3)²-80=x²+2x+1+x²-6x+9-80=2x²-4x-70=2(x²-2x-35)=2(x+5)(x-7)
x1+x2=2 U x1*x2=-35⇒x1=-5 U x2=7
[((x-4)²+(x-8)²-10]/[(x+1)²+(x-3)²-80]=2(x-5)(x-7)/2(x+5)(x-7)=(x-5)/(x+5)