Question

(b) (x + 2y + 3) (4x + 5y)​

Answer 1

Step-by-step explanation:

refer to the attachment

Answer 2

$(x + 2y + 3)(4x + 5y) \\ 4x(x + 2y + 3) + 5y(x + 2y + 3) \\ 4 {x}^{2} + 8xy + 12x + 5xy + 10 {y}^{2} + 15y \\ 4 {x}^{2} + 13xy + 12x + 10 {y + 15y}^{2}$