Question

решите уравнение x²-5x-1=0

Answer 1

x²-5x-1=0
D=(-5)²-4*(-1)*1=29
x=(5+√29):2
x=(5-√29):2

Answer 2

спасибо,

Answer 3

$x^{2} -5x-1=0\x^{2} -5x=1\x^{2} -5x+(frac{5}{2})^{2} =1+(frac{5}{2} )^{2}\(x-frac{5}{2})^{2} =frac{29}{4} \\x-frac{5}{2}=-frac{sqrt{29} }{2} \x_{1} =frac{-sqrt{29} +5}{2} \\x-frac{5}{2} =frac{sqrt{29}}{2}\x_{2} =frac{sqrt{29} +5}{2}$