Question

resolva as equação do segundo grau incompletas 2x²+x=0

Answer 1

$2 x^{2} +x=0\\ por.evidencia\\\\ x(2x+1)=0\\\\ x=0\\\\ 2x+1=0\to 2x=-1\to x=- \frac{1}{2} \\\\\\ S=(- \frac{1}{2};0)$

Answer 2

2x² + x = 0

Por Bháskara

a = 2
b = 1
c = 0

Δ = b² - 4.a.c
Δ = 1² - 4.2.0
Δ = 1 - 0
Δ = 1

x = - b + - √Δ/2a
x = - 1 + - √1/2.2
x = - 1 + - 1/4

x' = 0/4 ⇒ x' = 0
x" = - 2/4 ⇒ x" = - 1/2

S = { 0 e - 1/2 }