SOLUTION: 5(r+2)7r 5r+10*7r 35r+10 ???? Is this right? I don't really know what to do with the 7r at the end of this problem.

Algebra ->  Algebra  -> Distributive-associative-commutative-properties -> SOLUTION: 5(r+2)7r 5r+10*7r 35r+10 ???? Is this right? I don't really know what to do with the 7r at the end of this problem.       Log On

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Question 12561: 5(r+2)7r
5r+10*7r
35r+10 ????
Is this right? I don't really know what to do with the 7r at the end of this problem.

Answer by Earlsdon(6103) About Me  (Show Source):
You can put this solution on YOUR website!
Well, not quite! Try this:
5(r+2)7r Rearrange the expression to: (5)(7r)(r+2) Remember that multiplication is commutative.
%285%29%287r%29%28r%2B2%29+=+35r%28r%2B2%29 = 35r%5E2+%2B+70r