Posted by Suzanne on Friday, April 15, 2011 at 10:16am.
first note that we can't combine radicals if the radicands (term inside a radical sign) are not equal.
notice that we can further simplify squareroot of 45 as
sqrt(45) = sqrt(3*3*5) = sqrt(3^2 * 5) = 3*sqrt(5)
now, we can combine them:
3*sqrt(5) + 4*sqrt(5)
7*sqrt(5)
hope this helps~ :)
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