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Multiplying Polynomials

1. $(4x^2+7x)(6x^2-9x-10)$

2. $(2x^3+x)(x^2-x-1)$

3. $(-x^2-3y+7x)(2x^2-5y-3)$

4. $(x^4+3x-4)(x^2-y-9)$

5. $(4x+7)(-2x^3-9x^2+5)$

6. $(3x^3+7x^2+8x+4)(3x+4)$

7. $(x^2+7z-8)(-x^2-2x-12)$

8. $(5x^2-5x)(-3x^2-2x-5)$

9. $(-3x^2-7y^2)(x^2-y-10x)$

10. $(4x^2+x+1)(4x^2+x+1)$

11. $(x^5+7x^3)(x^2+1x+3)$

12. $(-x-y-z)(x+y+z)$