Sagot :
Réponse :
bonjour
A = 15 x² + 6 x - 35 x - 14
= 15 x² - 29 x - 14
B = 15 x + 20 x² - 24 - 32 x
= 20 x² - 17 x - 24
C = 9 x - 6 x² + 3 - 2 x - 5 x - 15 x² + 3 + 9 x
= - 21 x² + 11 x + 6
D = 36 x² + 36 x + 9 + 4 ( 12 x² + 21 x - 8 x - 14 )
= 36 x² + 36 x + 9 + 48 x² + 84 x - 32 x - 56
= 84 x² + 88 x - 47
E = 3 x - 2 - 9 x² + 6 x - ( 5 x - 5 x² - 1 + x )
= - 9 x² + 9 x - 2 - 5 x + 5 x² + 1 - x
= - 4 x² + 3 x - 1
fais le dernier
Explications étape par étape :
Bonsoir,
Développer:
A= (3x-7)(5x + 2)= 15x²-35x+6x-14= 15x²-29x-14
B = (-5x+8)(-3-4x)= 15x-24+20x²-32x= 20x²-17x-24
C = (3x+1)(3-2x)+(5x-3)(-1-3x)= 9x+3-6x²-2x-5x+3-15x²+9x= -21x²+11x+6
D = (6x - 3)2 +4(3x-2)(4x +7)= 36x²-18x-18x+9+4(12x²-8x+21x-14)
= 36x²-36x+9+4(12x²+29x-14)= = 84x²+16x-47
E = (1-3x) (3x-2)-(5x - 1)(1-x)=3x-9x²-2+6x-(5x-1-5x²+x)=-9x²+9x-2-(-5x²+6x-1)
= -9x²+9x-2+5x²-6x+1= -4x²+3x-1
F=3(3x-2)(-3-3x) -5(4x-1)2=3(-9x+6-9x²+6x)-5(16x²-8x+1)
= 3(-9x²-3x+6)-80x²+40x-5= -27x²-9x+18-80x²+40x-5 = -107x²+31x+13