Répondre :
bonjour
7(x+3)-(2x-3) -3x(2x-5)+3x²-5x
= 7 x + 21 - 2 x + 3 - 6 x² + 15 x + 3 x² - 5 x
= - 3 x² + 15 x + 24
Bonsoir,
7(x+3)-(2x-3) -3x(2x-5)+3x²-5x
= 7x +21 -2x +3 -6x² +15x +3x² -5x
= -3x² +15x +24
bonjour
7(x+3)-(2x-3) -3x(2x-5)+3x²-5x
= 7 x + 21 - 2 x + 3 - 6 x² + 15 x + 3 x² - 5 x
= - 3 x² + 15 x + 24
Bonsoir,
7(x+3)-(2x-3) -3x(2x-5)+3x²-5x
= 7x +21 -2x +3 -6x² +15x +3x² -5x
= -3x² +15x +24