Question

Ma poate ajuta cnv aici?
va rogg​

Answer 1

Răspuns:

a) D=b²-4ac= 36+4=40   x1=(-b-$\sqrt{D}$)/2a= (6-2$\sqrt{10}$)/2= 2(3-$\sqrt{10}$)/2 = 3-$\sqrt{10}$=3-3.16= -0.16  (rotunjit=-0,2)

x2=(-b+$\sqrt{D}$)/2a=2(3+$\sqrt{10}$)/2= 3+3.16=6,16 (rotunjit= 6,2)

b) $x^{2}$+5x-x+1=0    $x^{2}$ +4x+1=0  D= 16-4=12  

x1=(-4- 2$\sqrt{3}$)/2= -2(2-$\sqrt{3}$)/2= -2-$\sqrt{3}$= -2-1,73= -3,73 (rotunjit =- 3,7)

x2=2(-2+$\sqrt{3}$)/2= -2+$\sqrt{3}$= -2+1,73= -0,27   (rotunjit= -0,3)

c) $x^{2}$-x-x-2=0   $x^{2}$-2x-2=0   D=4-4*(-2)=4+8=12

x1=(2-2$\sqrt{3}$)/2= 2(1-$\sqrt{3}$)/2= 1-1,73= -0,73 ( rotunjit =-0,7)

x2=2(1+$\sqrt{3}$)/2= 1+$\sqrt{3}$= 1+1,73=2,73   (rotunjit=2,7)