What is the square root of $- 72$ ?

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Solution

Explanation:
$\sqrt{- 72}$
$= \sqrt{- 1 \times 8 \times 9}$
$= \sqrt{- 1 \times 2^{2} \times 2 \times 3^{2}}$
$= (2.3) \sqrt{- 1 \times 2}$
$= 6 \sqrt{- 1 \times 2}$
We will be able to bring out $- 1$ by denoting it as $i$ .
$= 6 \sqrt{- 1 \times 2}$
$= 6 i \sqrt{2}$

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Question 72

State whether the following statement is true or false:

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