Question

5x в квадрате -3x-2=0

Answer 1

5x^2 - 3x - 2 = 0 
D = 9 + 4*2*5 = 9 + 40 = 49 = 7^2
x1 = ( 3 + 7)/10 = 10/10 = 1
x2 = ( 3 - 7)/10 = - 4/10 = - 2/5 

Answer 2

$5 x^{2} -3x-2=0$
a=5;b=-3;c=-2;
$D=9-4*5*(-2)=49$ ДВА КОРНЯ
$x_1= frac{3+7}{10}=1$
$x_2= frac{3-7}{10}=-0.4$