Question

calcular as raízes usando a fórmula de bhasca -2x elevado a 2+7x -3=0

Answer 1

- 2x^2 + 7x - 3 =0 (-1)

2x^2 - 7x + 3 = 0

a = 2; b = - 7; c = 3

∆ = b^2-4ac

∆ = (-7)^2 - 4.2.3

∆ = 49 - 24

∆ = 25

x = [ - b +/- √∆]/2a

x = [ -(-7) +/- √25]/2.2

x = [ 7 +/- 5]/4

x' = [ 7+5]/4 = 12/4 = 3

x" = [7 - 5]/4 = 2/4 (:2)/(:2) = 1/2

R.: { 3 ; 1/2 }