Question

The cube root of square of 27 is _____

• A. 27
• B. 729
• C. 3
• D. 9

Answer 1

The correct option is D 9

Square of 27 is ${27}^2=27\times 27=729.$

Now, 729 can be written as:
$729=9\times 9\times 9=9^3$

$\therefore \sqrt[3]{3729}=\sqrt[3]{39^3}=9$

So, the cube root of square of 27 is 9.