SOLUTION: Combine: 7 sqrt 245 + 8 sqrt 80 - 3 sqrt 180. I am coming up with 63 sqrt 5. Is this correct? Please include steps if it is not. Thank you.

Algebra ->  Square-cubic-other-roots -> SOLUTION: Combine: 7 sqrt 245 + 8 sqrt 80 - 3 sqrt 180. I am coming up with 63 sqrt 5. Is this correct? Please include steps if it is not. Thank you.      Log On


   

Question 761259: Combine:
7 sqrt 245 + 8 sqrt 80 - 3 sqrt 180.
I am coming up with 63 sqrt 5. Is this correct? Please include steps if it is not. Thank you.
Answer by ramkikk66(644) About Me  (Show Source):
You can put this solution on YOUR website!
7 sqrt 245 + 8 sqrt 80 - 3 sqrt 180.
The expression is:
7%2Asqrt%28245%29+%2B+8%2Asqrt%2880%29+-+3%2Asqrt%28180%29
=
7%2Asqrt%2849%2A5%29+%2B+8%2Asqrt%2816%2A5%29+-+3%2Asqrt%2836%2A5%29
=

=
7%2A7%2Asqrt%285%29+%2B+8%2A4%2Asqrt%285%29+-+3%2A6%2Asqrt%285%29
=
49%2Asqrt%285%29+%2B+32%2Asqrt%285%29+-+18%2Asqrt%285%29
=
63%2Asqrt%285%29
You are right:)