Question

The square root of the sum of a number and 12 is 9. Find the number.
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Answer 1

The answer is 12.4641016151

Explanation:

Trust me, I did this on a test before

Answer 2

The number is 69.

Explanation:

`√((x+12)) =9`

Square both sides.

`x+12=81`

Solve for x. Subtract 12 from both sides.

`x=81-12\\x=69`

Check.

`√((69+12)) =9\\√(81) =9`