Question

How do you simplify `3sqrt7-2sqrt28`?

Answer 1

`5sqrt7`

Explanation:

7 is a prime number so obviously there is no rational answer for `sqrt7`

Write 28 as the product of its prime factors to see what it is made of.

`3sqrt7 + sqrt (2xx2 xx 7)`

=`3sqrt7 + 2sqrt7`

=`5sqrt7 " there are like terms"`