Divide the polynomials, you can leave a remainder
19. (x^3 + 12x^2 + 27x - 45) ÷ (x + 6)
20. (5b^3 + 27b^2 - 22b - 22) ÷ (b + 6)
Expand using the binomial theorem
25. (a + 2)^3
26 (y - 5)^3