Question

Resolva as equações : 2x²+x-6=0

Answer 1

Silvinha,

2x² + x - 6 = 0

a = 1

b = 1

c = -6

Δ = 1² - 4.2.(-6)

Δ = 1 + 48

Δ = 49

x = -b +- √Δ / 2.a

x = -1 +- √49 / 2.2

x = -1 +- 7 / 4

x' = -1+7/4 = 6/4 = 3/2

x'' = -1-7/4 = -8/4 = -2

S = {-2, 3/2}

Answer 2

Resposta:

Explicação passo-a-passo:

2x²+x-6=0

a = 2; b = 1; c = - 6

/\ = b^2 - 4ac

/\ = 1^2 - 4.2.(-6)

/\ = 1 + 48

/\ = 49

x = [- b +/- \/ /\]/2a

x = [- 1 +/- \/49]/2.2

x' = [- 1 + 7]/4 = 6/4 = 3/2

x" = [- 1 - 7]/4 = -8/4 = - 2

Resp.: {- 2 ; 3/2}