Question

What is the following sum? 4√5+2√5 a. 6√10 b. 8√10 c. 6√5 d. 8√5

Answer 1

Since the radicands (the number under the radical) are the same, add the coefficients and keep the radicand.
4√5  + 2√5  = 6√5
LETTER C

Answer 2

For this case we have the following expression:

$4 \sqrt {5} +2 \sqrt {5}$

We can rewrite the expression by taking a common factor.

We have then:

$\sqrt {5} (4 + 2)$

From here, add the expression within the parenthesis we have:

$6 \sqrt {5}$

Answer:

The equivalent expression for $4 \sqrt {5} +2 \sqrt {5}$ is given by:

$6 \sqrt {5}$

Option C