Question

(2x+1)^3=-8

Answer 1

Tìm x, biết:

(2x + 1)³ = -8

(2x + 1) = \(\sqrt[3]{-8}\) = -2

2x = (-2) + (-1)

x = (-3) : 2

x = \(\dfrac{-3}{2}\)

Vậy x = \(\dfrac{-3}{2}\);

Answer 2

(2x+1)^3=-8

(2x+1)^3=(-2)^3

suy ra: 2x+1=-2

2x=-2 -1

2x=-3

x=-3:2

x= \(\dfrac{-3}{2}\)