Question

which of following is equal to 9
`√(64)`
`√(100)`
`√(121)`
`√(81)`

Answer 1

We have 4 expressions of square roots and we want to know which one is equal to 9.

We can find this by writing:

`\sqrt[]{x}=9`

where x is the number within the square root.

Then, we can solve as:

`\begin{gathered} \sqrt[]{x}=9 \\ (\sqrt[]{x})^2=9^2 \\ x=81 \end{gathered}`

Answer: the square root of 81 is equal to 9.