Simplify. (polynomials)
1. ()(3c^d) =
2. (2x^2)(3x^6) - (4x^4)(2x^4) =
3. (6x^2)(3x^6) + (4x^4)(2x^4) =
4. (2ab^2)^2(-3a^2b^2) =
5. -6a^3(a^2-2a+1) =
6. -2xy(x^2-3xy+y^2) =
7. (a+b) (2a^2-ab+3b^2) =
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