Question

Simplify the sum or difference: $\sqrt{5}+6\sqrt{5}$.

• A. $6\sqrt{5}$
• B. $30$
• C. $6\sqrt{10}$
• D. $7\sqrt{5}$

Answer 1

The correct option is D

$7\sqrt{5}$

Explanation for the correct option:

Given that $\sqrt{5}+6\sqrt{5}$

By adding we get,
$$\begin{gathered} \sqrt{5}+6\sqrt{5}=(1+6)\sqrt{5} \\ =7\sqrt{5} \end{gathered}$$

Hence, option(D) is correct.