5sqrt(81)
is the same as saying .....
5 * 9
= 45
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The square root (radical) of 5 is about 2.2361 (an irrational number)
sqrt(162) = sqrt(81*2) = sqrt(81)*sqrt(2) = 9*sqrt(2)
sqrt(162) = sqrt(81*2) = sqrt(81)*sqrt(2) = 9*sqrt(2).
5 radical 3 is just a number.So, asking this is the same as asking 'What are some equivalents to 3?' One could answer 2 * 3 / 2. But this reduces to 3.The situation is the same for your question. One could offer some multiple of 5 radical 3 as an answer but, being a multiple, it would reduce to 5 radical 3.radical 3 is approximately 1.732 but not exactly 1.732 so one cannot say, for instance, that 5 radical 3 = 5 (1.732) = 8.660. In fact, there is not way of expressing radical 3 with a finite number of decimal places. So no-one can write radical 3 = 1.732.... exactly.5 radical 3 is the best one can do.
sqrt(25/81) = +/- 5/9