Please clearly explain solutions and give all necessary steps.

3. Simplify the following Boolean functions by first finding the essential prime implicants F(u, x, y, z)=(1,3,6, 7, 8. 9. 12, 13, 14, 15); (a) (b) F(A,B,C,D)=(0, 2, 3, 5, 7, 8, 10, 11, 13, 15). 4. Simplify the following expressions to (1) sum-of-products and (2) product-of-sums: (b) ABC" AB'D DCB