Question

what is the value of root over 21?

Answer 1

Hii There!!!!

√21 = 4.582575

Hope it helps

Answer 2

$\sqrt{21} = 4.583$

Answer:

21=3⋅7 has no square factors, so √21 cannot be simplified.

√21≈4.58257569495584000658 is an irrational number whose square is 21.

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.