Posted by **Melissa** on Sunday, October 2, 2011 at 2:50am.

simplify

1. (2x^4-3x^2-6)+(6x^4-x^3+4x^2+5)

2. -7x(x^2+x-1)-3x(2x^2-5x+6)

3. -2x[ 5x-(2x-7)]+6x[3x-(1+2x)]

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