(x+4) в квадрате=4 x в квдрате+5
X²+8x+16=4x²+5 x²+8x+16-4x²-5=0 -3x²+8x+11=0 D=b²-4ac; D=64-4*(-3)*11=64+132=196=14² x1=(-8+14)/(-6)=-1; x2=(-8-14)/(-6)=22/6=11/3
X^2+8x+16=4x^2+5 X^2-4x^2+8x+11=0 3x^2-8x+11=0 D=64+132=196 X1=8+14/6=22/5=11/3 X2=8-14/6=-1