20 points! Find the GCF of

3x³y⁵z and 21xy³z⁴.

10. Divide (3x-2)(x-4)-(x-4)(6-5x) / (4-x)(8x-1)

Factor 32x³ – 32x² + 8x by first finding the GCF, then factor the quadratic that is left. Be sure to factor completely and show your work. If this is not possible for some reason, state why.

Factor x² + 9 using any method you choose. Show your work. If this is not possible for some reason, state why.

19. The product of two consecutive positive integers is 42. Write and solve a quadratic equation to find the solutions. Then show how you use those solutions to find the two consecutive positive integers.