Question

(2x+1).(x+2) como resolver?

Answer 1

Boa noite Jessy

(2x+1).(x+2) = 0

basta zerar os dois termos

2x + 1 = 0
2x = -1
x = -1/2

x + 2 = 0
x = -2 

com a formula de Bhaskara 

(2x + 1)*(x + 2) = 0
2x² + 5x + 2 = 0

delta
d² = 25 - 16 = 9
d = 3

x1 = (-5 + 3)/4 = -2/4 = -1/2
x2 = (-5 - 3)/4 = -8/4 = -2