Question

Use prime factorisation to find the square root of $1225$.

• A. $122$
• B. $225$
• C. $35$
• D. $50$

Answer 1

The correct option is C $35$

$1225=5\times 5\times 7\times 7=35\times 35$
$\sqrt{1225}=\sqrt{5\times 5\times 7\times 7}=5\times 7=35$