Please help! 3 Questions please show how you solved the problem
1. Subtract & simplify
(–y2 – 4y – 8) – (–4y2 – 6y + 3)

2.Multiply and simplify
2x2y3z2 · 4xy4x2

3.Multiply and simplify
(x – 4) (x2 – 5x – 6)