Question

Encontre as raizes de 3x² + 2x - 5 = 0

Answer 1

3x² + 2x - 5 = 0
a= 3; b = 2; c = - 5
∆ = b^2-4ac
∆ = 2^2 - 4.3.(-5)
∆ = 4 + 60
∆ = 64
x = [ - b +/- √∆]/2a
x = [ - 2 +/- √64]/2.3
x' = [ - 2 + 8]/6 = 6/6 = 1
x" = [ - 2 - 8]/6 = - 10/6 (:2)/(:2) = - 5/3

R.: (- 5/3 ; 1)