Question

решите уравнение 5x²+4x-1+=0

Answer 1

D= 16-4×5×(-1)=36
D=6
$x = frac{ - 4 + 6}{10} = frac{2}{10} = frac{1}{5}$
$x = frac{ - 4 - 6}{10} = frac{ - 10}{10} = - 1$
$x = frac{1}{5}$
$x = - 1$