Решите уравнение
[tex]x^{2} - 5x - 1 = 0[/tex]
Решите систему уравнений
[tex] \left \{ {{ x^{2}- y=-2} \atop {2x+y=2}} \right. [/tex]
[tex]x^{2} - 5x - 1 = 0[/tex]
Решите систему уравнений
[tex] \left \{ {{ x^{2}- y=-2} \atop {2x+y=2}} \right. [/tex]
Answers & Comments
Verified answer
X²-5x-1=0D=25+4*1=29
x=(5+-√29)/2
x²-y=-2
y=2-2x
x²-2+2x=-2
y=2-2x
x²+2x=0
y=2-2x
x(x+2)=0
y=2-2x
x=0 y=2
x=-2 y=2+4=6