Question

Simplify 5√7+√7−2√7

A.4√7
B.3√21
c.3√7
d.4√21
i really am stuck on this problem.

Answer 1

5√7+√7−2√7

Going from left to right:

5√7+√7 = 6√7

6√7 - 2√7 = 4√7

The answer is A. 4√7