Question

5x elevado a 2 -3x-2 = 0

Answer 1

$5x^{2} -3x-2 = 0$
Δ =$b ^{2} -4.a.c$
Δ = $-3^{2} -4.5.(-2)$
Δ = $9 +40$
 Δ= $49$

$x =-b+ou- \sqrt{ \alpha } /2.a$
 $x= 3+ou-7/10$
$x` = 3-7/10$
$x`=-4/10, x`= -2/5$

$x``= 3+7/10$
$xx``=10/10$
$x`` =1$