3*sqrt(45) - 3*sqrt(5) =3*sqrt(9*5) - 3*sqrt(5) = 3*sqrt(9)*sqrt(5) - 3*sqrt(5)
= 3*3*sqrt(5) - 3*sqrt(5) (taking the principal root)
= 9*sqrt(5) - 3*sqrt(5) = 6*sqrt(5)
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24
Square root of 9 is 3... (-7) - 3 = -10 ... Answer: -10
3 times the square root of 5
6
Four of anything minus one of the same thing always leaves three of them.