Question

x2+2x-4=0 корни плиз. оч нодо

Answer 1

$x^{2} +2x-4=0$
$D= b^{2} -4ac= 2^{2}-4*1*(-4)=4+16=20$
$x_{1,2} = frac{-b+- sqrt{D} }{2a}= frac{-2+- sqrt{20} }{2*1}= frac{-2+- sqrt{20} }{2}= left { {{x= frac{-2- sqrt{20} }{2} } atop {x= frac{-2+ sqrt{20} }{2} }} right.$