Question

(2x+1)³ = 125
 

Answer 1

(2x+1)³=125

=>2x+1=5

=>2x=5-1

=>2x=4

=>x=4:2

=>x=2

Answer 2

(2x+1)³=125

=>2x+1=5

=>2x=5-1

=>2x=4

=>x=4:2

=>x=2

Answer 3

( 2x + 1 )³ = 125

( 2x + 1 )³ = 5³

\(\Rightarrow\)2 x + 1 = 5  ( mỗi vế đã triệt tiêu đi mũ 3)

 2x = 5-1

2x = 4

x = 4 : 2

x = 2

Vậy x = 2