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What is $\sqrt{81}$ ? $\newline$ or

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Full solution

Q. What is

\sqrt{81}

?

\newline

____ or ____

Identify Number: Identify the number whose square root is to be found. $\newline$ We need to find the square root of $81$ .
Recall Perfect Squares: Recall the perfect squares that are close to $81$ to determine its square root. $\newline$ $9 \times 9 = 81$ , so the square root of $81$ is $9$ .
Write Positive Square Root: Write down the positive square root of $81$ . The positive square root of $81$ is $9$ .
Write Negative Square Root: Since the square root symbol represents both the positive and negative roots, write down the negative square root of $81$ . The negative square root of $81$ is $-9$ .

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