Question

Simplify:
1. (a+b) (a-2b)+ab
2. (3x+4y) (2x+3y)-17xy


ps: pls help guys gotta finish a whole lott of homework!

Answer 1

$(3x + 4y)(2x + 3y) - 17xy \\ 6 {x}^{2} + 9xy + 8xy + 12 {y}^{2} - 17xy \\ 6 {x}^{2} + 12 {y}^{2}$

$(a + b)(a - 2b) + ab \\ {a}^{2} - 2ab + ab - 2 {b}^{2} + ab \\ {a}^{2} - 2 {b}^{2}$