Aidez moi a faire le calcul étapes par étapes svp : Developper :x(x-2)+4x-5x(3x-1)

x(x-2)+4x-5x(3x-1)
= x*x - x*2 +4x -5x*3x + (-5x)*1 =
= x² - 2x + 4x -15x² + (-5x)
= x² +2x -15x² - 5x
= -14x² - 3x

x(x-2) + 4x - 5x(3x - 1)
= [(x*x) - (2*x)] + 4x - [(5x*3x) - (5x*1)]
= (x² - 2x) + 4x - (15x² - 5x)
= x² - 2x + 4x - 15x² + 5x
= x² - 15x² - 2x + 4x + 5x
= - 14x² + 7x