Question

2X elevado a 2 -3x-5=0

Answer 1

Eduarda,

2x²- 3x - 5 = 0

a = 2
b = -3
c = -5

Δ = b² - 4.a.c
Δ = (-3)² - 4.2.(-5)
Δ = 9 + 40
Δ = 49

Se Δ > 0, logo:

x = -b +- √Δ / 2.a
x = (-3) +- √49 / 2.2
x = 3 +- 7 / 4

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

S = {5/2, 1}