(3x - 2y) ( 4x + 6y ) - 5x (3x + 2y)
= 12 x^2 - 8xy + 18xy - 12y^2 - 15x^2 - 10xy
= -3x^2 - 20 xy - 12 y^2
Hej!
(3x - 2y)(4x + 6y) - 5x(3x + 2y) =
= 12x² + 18xy - 8xy - 12y² - 15x² - 10xy =
= -3x² - 12y²
Pozdrawiam! - Julka
