Question

Tìm x:

a) \(\dfrac{3}{2}\) |2+x| = \(\dfrac{5}{4}\)

b) (2x + 1)³ = -8

Answer 1

a,

b, (2x + 1)³ = -8

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

2x + 1 = -2

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

x = (-3) : 2

x = \(\dfrac{-3}{2}\) hay \(-1\dfrac{1}{2}\) hay -1,5

Answer 2

a: =>|x+2|=5/4:3/2=5/4*2/3=10/12=5/6

=>x+2=5/6 hoặc x+2=-5/6

=>x=-17/6 hoặc x=-7/6

b: =>2x+1=-2

=>2x=-3

=>x=-3/2