Question

 5x2 - 3x - 2 = 0. ne ajudem

Answer 1

5x²-3x-2=0

∆=(-3)²-4(5)(-2)
∆=9+40
∆=49

$x = \frac{ - b± \sqrt{deta} }{2a}$
${x}^{ l } = \frac{ - ( - 3) + \sqrt{49} }{2(5)} = \frac{3 + 7}{10} = \frac{10}{10} = 1$
${x}^{ll} = \frac{ - ( - 3) - 7}{2(5)} = \frac{3 - 7}{10} = \frac{ - 4}{10} = - \frac{2}{5}$

s={1,-2/5}

Answer 2

Resposta:

Explicação passo-a-passo:

5x^2 - 3x - 2 = 0

a = 5; b = - 3; c = - 2

∆ = b^2-4ac

∆ = (-3)^2 - 4.5.(-2)

∆ = 9 - 20.(-2)

∆ = 9 + 40

∆ = 49

x = [ - b +/- √∆]/2a

x = [ -(-3) +/- √49]/2.5

x = [ 3 +/- 7]/10

X' = (3 + 7)/10 = 10/10 = 1

x" = (3 - 7)/10 = -4/10 (:2)/(:2)

x" = - 2/5

R.:

x' = 1

x" = - 2/5