sqrt(2.25) is.
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3√2
3√2
You can rationalize the denominator by multiplying this fraction by a fractional form of one in radical form. 3/sqrt(2) * sqrt(2)/sqrt(2) = 3sqrt(2)/2 ----------------
12x^2√5x
5 - 2*sqrt(3) is already in simplest radical form, note that if you said 5 - sqrt(12) is definitely simplified to 5 - 2*sqrt(3).