Question

How do you simplify `sqrt84`?

Answer 1

`= 2 sqrt ( 21)`

Explanation:

`sqrt (84)`

We first prime factorise `84` ( express it as a product of prime factors)

`sqrt (84) = sqrt ( 2 * 2 * 3 * 7)`

`= sqrt ( 2^2 * 3 * 7 )`

`= sqrt ( 2^2 * 21 )`

`= 2 sqrt ( 21)`