Question

route 21 is a rational or irrational​

Answer 1

Answer:

irrational

Step-by-step explanation:

Therefore 21≠a2 , so a≠√21 , meaning that our earlier assumption of √21 being rational turns out to be wrong, therefore √21 is irrational.

Answer 2

Answer:

21=3⋅7 has no square factors, so √21 cannot be simplified. √21≈4.58257569495584000658 is an irrational number whose square is 21

Step-by-step explanation:

Explanation:

√21=√3⋅7

has no square factors that can be 'moved outside the square root sign'.

For example

√12=√22⋅3=√22√3=2√3

So

√21

cannot be simplified.

It cannot be expressed as a rational number (fraction), so the best we can do with normal notation is to either stick with

√21

or give an approximation, such as

√21≈4.58