Question

Подробное решение. Спасайте.

Answer 1

$(6x-4y)(-9x-4)-(-3x+7y)(8x+2)=-54x^2-24x+36xy+ \\ +16y-(-24x^2-6x+56xy+14y)=-54x^2-24x+36xy+16y+ \\ 24x^2+6x-56xy-14y=-30x^2-18x-20xy+2y$

Answer 2

(6x - 4y)(- 9x - 4) - (- 3x + 7y)(8x + 2) = - (6x - 4y)(9x + 4) - (7y - 3x)(8x + 2) =
= - 54x² - 24x + 36xy + 16y - 56xy - 14y + 24x² + 6x = - 30x² - 20xy - 18x + 2y