Question

$\sqrt{1764}$ is

• A. 43
• B. 56
• C. 42
• D. 48

Answer 1

The correct option is C

42

$\begin{array}{cc}2& 1764\\ 2& 882\\ 3& 441\\ 3& 147\\ 7& 49\\ 7& 7\end{array}$
$1764=2\times 2\times 3\times 3\times 7\times 7=2^2\times 3^2\times 7^2\therefore \sqrt{1764}=2\times 3\times 7=42$