-2×ao quadrado + 10×-8= 0?

4x^2 + 10x - 8 = 0

a = 4

b = 10

c = -8

Delta = -b^2 - 4.a.c

100 - 4.(-2).(-8) = 0

100 - 64

Delta = Raiz de 36

Delta = 6

= -b + ou - raiz de Delta / 2.a

x1 = -10 - 6 / 2.4

-16 / 8

= -2

x2 = -10 + 6 / 2.4

-4 / 8

= -1/2