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How do you simplify #3sqrt5-5sqrt+9sqrt5#?

How do you simplify #3sqrt5-5sqrt+9sqrt5#?
algebra   Radicals-And-Geometry-Connections   Addition-And-Subtraction-Of-Radicals   
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Answer #1

#-12sqrt5#

Explanation:

#3sqrt5-5sqrt+9sqrt5#

#:.=3sqrt5-5sqrt(3*3)sqrt5#

#sqrt3*sqrt3=3#

#:.=3sqrt5-5xx3sqrt5#

#:.=3sqrt5-15sqrt5#

#:.=sqrt5(3-15)#

#:.=-12sqrt5#

answered by: Barney V.
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