(8x + 3y)(5y - x) - (6x + 4y)(3y - 5x) = 40xy - 8x² + 15y² - 3xy - 18xy + 30x² - 12y² +
+20xy =22x² + 39xy + 3y²
(8x + 3y)(5y - x) - (6x + 4y)(3y - 5x) = 40xy - 8x² + 15y² - 3xy - 18xy + 30x² - 12y² +
+20xy =22x² + 39xy + 3y²