Posted by **brooke** on Sunday, March 27, 2011 at 2:46pm.

7 (r+3s) - 2(2r -9s)

I am having a hard time solving can anyone please help

- grade 9 polynomials -
**Mark**, Sunday, March 27, 2011 at 2:56pm
Multiply the # outside the parenthesis by each item inside the parenthesis to remove the parentesis and then combine the like terms (r's & s's).

- grade 9 polynomials -
**carla**, Sunday, March 27, 2011 at 2:57pm
7r + 21s - 4r + 18S

then combine like terms

- grade 9 polynomials -
**brooke**, Sunday, March 27, 2011 at 3:17pm
7r +21s - 4r +18s

7r-4r =21s+18s

3r+39

Does this sound correct.

- grade 9 polynomials -
**Mark**, Sunday, March 27, 2011 at 4:39pm
Yes , but 39s

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