Question

resposta do cálculo 3 + 2x ao quadrado + 5x = 0 ​

Answer 1

$3+2x^2+5x=0$

$\triangle=b^2-4.a.c=5^2-4.2.3=25-24=1$

$x_1=\frac{-b+\sqrt{\triangle} }{2a}=\frac{-5+\sqrt{1} }{2.2}=\frac{-5+1}{4}=\frac{-4}{4}=-1$

$x_2=\frac{-b-\sqrt{\triangle} }{2a}=\frac{-5-\sqrt{1} }{2.2}=\frac{-5-1}{4}=\frac{-6}{4}=-\frac{3}{2}$

$S=\{-\frac{3}{2},\ -1\}$