Question

помогите срочно 

Answer 1

$5x^2+8x-4=0 \\ D=b^2-4ac=8^2-4*5*(-4)=64+80= \sqrt{144} =12 \\ x= \frac{-b+D}{2a} \\ x1= \frac{-8+12}{10}= \frac{4}{10}= \frac{2}{5} \\ x2= \frac{-8-12}{10}=-2$

Ответ:x1 = $\frac{2}{5}$ и x2 =$-2$