Question

\(\dfrac{x+1}{9}=\dfrac{3}{\left(x+1\right)^2}\)

Answer 1

\(\dfrac{x+1}{9}=\dfrac{3}{\left(x+1\right)^2}\)

`(x+1).(x+1)^2 =3.9`

`(x+1)^3 = 27`

`(x+1)^3=3^3`

`x+1=3`

`x=3-1`

`x=2`

Vậy `x=2`