Question

помогите решить
(x-7)(3x-2)-(5x+1)(2x-4)

Answer 1

$3x {}^{2} - 2x - 21x + 14 - (10x - 20x + 2x - 4)$

$3x {}^{2} - 2x - 21x + 14 - (10x {}^{2} - 18x - 4)$

$3x {}^{2} - 2x - 21x + 14 - 10x {}^{2} + 18 + 4$

ответ:

$- 7x {}^{2} - 5x + 18$