Question

Equaçao de 2 grau:      
5x(ao quadrado)-3x-2=0

Answer 1

5 x² - 3 x  - 2 = 0
Δ = b² - 4 a . c
Δ = (-3)² - 4 . 5 . - 2
Δ = 9 + 40
Δ = 49 ⇒ √49 = 7
x = - b +ou- 7/2 . a
x = -(-3) +ou-7/2.5
x = 3 +ou- 7/10
x´= 3 + 7/ 10
x´= 10/10 ⇒ x´= 1
x" = 3 - 7 /10
x" =-4/10
x" = -2/5
S = {-2/5 ,1}