Question

$4\sqrt{21}+6\sqrt{21}=?$

• A. $$24\sqrt{21}$$
• B. 31
• C. $$10\sqrt{21}$$
• D. 42

Answer 1

Answer:

$$10\sqrt{21}$$

$a\sqrt{m}+b\sqrt{m}=(a+b)\sqrt{m}$

$4\sqrt{21}+6\sqrt{21}=10\sqrt{21}$