bonjour
24 x² - 16 x + 24 x - 16 - ( - 14 x² - 14 x - 12 x + 12 )
= 24 x² + 8 x - 16 + 14 x² + 26 x - 12
= 38 x² + 34 x - 28
Bonsoir,
Développer :
= (-4x-4)(-6x+4)-(-7x-6)(2x+2)
= 24x²-16x+24x-16-(-7x-6)(2x+2)
= 24x²-16x+24x-16+(7x+6)(2x+2)
= 24x²-16x+24x-16+14x²+14x+12x+12
= 38x²-16x+24x-16+14x+12x+12
= 38x²+34x-16+12
= 38x²+34x-4
Bonne soirée.
