Bonsoir,
(x+3)(2x+1)+(3-x)(5x+2)
= 2x²+x+6x+3+15x+6-5x²-2x
= -3x²+20x+9
(7x+1)(7x-3)-(2x+1)(3x-2)
= 49x²-21x+7x-3-(6x²-4x+3x-2)
= 49x²-21x+7x-3-6x²+4x-3x+2
= 43x²-13x-1
(2x+3)²+(8x-2)²-(x+1)(x-1)
= 4x²+12x+9+64x²-32x+4-(x²-1)
= 67x²-20x+14
Réponse :
Explications étape par étape
