Question

what is the following sum?
$4\sqrt{5} + 2\sqrt{5}$
$8\sqrt{10}$ $6\sqrt{5}$ $6\sqrt{10}$
$8\sqrt{5}$

Explanation:

Step1: Identify like radicals

Both terms have $\sqrt{5}$, so they are like radicals.

Step2: Add the coefficients

The coefficients are 4 and 2. Add them: $4 + 2 = 6$.

Step3: Keep the radical part

Since the radical part is $\sqrt{5}$, the sum is $6\sqrt{5}$.

Answer:

B. $6\sqrt{5}$