Simplify.

3√7/25-√28/25+√63/25

4√7/5

Step-by-step explanation:

to take a root of a fraction, take the root of the numerator and denominator separately

3*√7/5-√28/5+√63/5

calculate the product

3√7/5-2√7/5+3√7/5

calculate the sum or difference

4√7/5