Question

2 x² = - 5 - 7x equaçao de 2 grau

Answer 1

2x^2=-5-7x
2x^2+7x+5=0
delta=b^2-4ac
delta=7^2-4.2.5
delta=49-40
delta=9
x=-b-/+ raiz de delta/2a
x=-7-3/2.2
x=-10/4 (:2)
x=-5/2
x=-7+3/2.2
x=-4/4
x=-1

Answer 2

2x² = - 5 - 7x
2x² + 7x + 5 = 0
a = 2; b = 7; c = 5

Δ = b² - 4ac
Δ = 7² - 4.2.5
Δ = 49 - 8.5
Δ = 49 - 40
Δ = 9

x = - b +/- √Δ = - 7 +/- √9
           2a               2.2

x = - 7 + 3 = - 4/4 = - 1
           4
x = - 7 - 3 = - 10  (:2) = - 5
          4          4   (:2)     2

R.: x = - 1 e x = - 5/2