Question

Solve of simplify the following problem, using the properties of roots:
$\sqrt{63}+\sqrt{28}$

• A. $5\sqrt{7}$
• B. $3\sqrt{7}$
• C. $4\sqrt{7}$
• D. $6\sqrt{7}$

Answer 1

The correct option is A $5\sqrt{7}$

$5\sqrt{7}:\sqrt{63}+\sqrt{28}=(\sqrt{9}\times \sqrt{7})+(\sqrt{4}\times \sqrt{7})=3\sqrt{7}+2\sqrt{7}=5\sqrt{7}$