Question

(5x-2y)(x+y)-5x²;
Срочно нужно помогите

Answer 1

$(5x - 2y)(x + y) - 5x {}^{2} \\ 5x {}^{2} + 5xy - 2xy - 2y {}^{2} - 5x {}^{2} \\ 5xy - 2xy - 2y {}^{2} \\ 3xy - 2y {}^{2}$