How do you simplify $4/sqrt21$ ? Thank you very much for your help.?

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Answer 1 · 2015-03-30T14:51:12

I don't know if it is much of a simplification but you could rationalize the denominator by multiplying the top and bottom by $sqrt(21)$

$4/sqrt(21) = (4sqrt(21))/(21)$

As I said, not much of an improvement, but some people prefer to keep roots out of the denominator.
There is no real simplification beyond this.

Answer 2 · 2015-03-30T14:58:55

I would multiply and divide by $sqrt(21)$ and get:
$4/sqrt(21)*sqrt(21)/sqrt(21)=4sqrt(21)/21=sqrt(336)/21$

How do you simplify 4/sqrt214/sqrt21? Thank you very much for your help.?