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posted by mema on Sunday, May 22, 2011 at 2:12pm.
Find the difference (-x^2+8x-7)-(9x^2-5x-7)
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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