SOLUTION: I need help to simlify this equation. -3(square root180)-7 (square root 45) What I came up with so far is -3(square root10)*(sqaure root18)-7 (square root9)* (square root5)

Algebra ->  Radicals -> SOLUTION: I need help to simlify this equation. -3(square root180)-7 (square root 45) What I came up with so far is -3(square root10)*(sqaure root18)-7 (square root9)* (square root5)      Log On


   



Question 574554: I need help to simlify this equation. -3(square root180)-7 (square root 45) What I came up with so far is -3(square root10)*(sqaure root18)-7 (square root9)* (square root5)
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Simplify:
-3sqrt%28180%29-7sqrt%2845%29 First, rewrite both radicands.
-3sqrt%2836%2A5%29-7sqrt%289%2A5%29 Now take the square root of the perfect squares: sqrt%2836%29+=+6 and sqrt%289%29+=+3 so...
-3%2A6sqrt%285%29-7%2A3sqrt%285%29 Simplify.
-18sqrt%285%29-21sqrt%285%29 Combine.
-39sqrt%285%29