Question

The square root of x + 3 equals 12

Answer 1

We are given

`\sqrt[\square]{x+3}\text{ = 12}`

Square both sides of the equation

`\begin{gathered} (\sqrt[\square]{x+3})^2=12^2 \\ x+3\text{ = 144} \end{gathered}`

subtract 3 from both sides

`\begin{gathered} x+3-3\text{ = 144-3} \\ x\text{ = 141} \end{gathered}`

Hence the value of x is 141