Posted by mema on Sunday, May 22, 2011 at 2:12pm.
1. Remove the 1st parenthesis.
2. Remove the 2nd parenthesis by multiplying each term by (-1):
-X^2+8X-7 - 9X^2+5X+7.
3. Combine like-terms and get:
-10X^2 + 13X.
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