Question

решите уравнение 5x²+4x-1+=0

Answer 1

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

Answer 2

D=16-4*5*(-1)=36
x1=(-4+6)/10=0.2
x2=(-4-6)/10=-1
Ответ: x1=0.2; x2=-1