(4n+7)(2n+3)=? (7z-2)(z-3)=? (6z-y)(2z-y)=? (10x+3z)(10x-5z)=?

Question

(4n+7)(2n+3)=?
(7z-2)(z-3)=?
(6z-y)(2z-y)=?
(10x+3z)(10x-5z)=?

Answer 1

1] 8n^2+26n+21

2}7z^2-23z+6

3}12z^2-8zy +y^2

4}100x^2-20zx-15z^2