I'm stuck on a part of my Maths homework.
3. Express the following as the product of factors
a. (4-z)^2 (2-z) + p(2-z)
b. (r-d)^3 + 5(r-d)^2
c. (b+c)^5 (a+b) - (b+c)^5
d. m(a-2x) + rp^2(2x-a)
4. Simplify each expression, leaving your answer in its factorised form
a. (p+q)^2 + 2q(p+q)
b. 2(2x-y)^2 - 6x(2x-y)
c. (r+6s)^2 - (r+6s) (r-s)
Any help would be appreciated on how to do these questions.