Question

5x2+3x-2=0 como faz?

Answer 1

$5 x^{2} -3x-2=0\\\\ a=5~~~~;~~~~~~b=-3~~~~~~~;~~~~~~c=-2\\\\ Ec.~gr.II=\ \textgreater \ Delta.$
∆=b²-4ac
∆=(-3)²-4•5•(-2)
∆=9+40
∆=49.
$=\ \textgreater \ x_1_,_2 \left \{ {{x_1= \frac{(-3)^2+ \sqrt{49} }{2*5}=\ \textgreater \ x_1= \frac{8}{5} } \atop { x_2= \left \ \frac{(-3)^2- \sqrt{49} }{2*5} =\ \textgreater \ x_2= \frac{1}{5} }} \right.$