Răspunsuri

2014-09-30T20:12:39+03:00
(x-3)²-(x+4)²-(x-√5)(x+√5)=
x²-6x+9-(x²+8x+16)-(x²-5)=
x²-6x+9-x²-8x-16-x²+5=0
-x²-14x+14=0    (-1)
x²+14x-14=0
Δ=196+56=252
X1=(-14+6√7)/2=2(-7+6√7)/2=6√7-7
X2=(-14-6√7)/2=......=-(7+6√7)