Sagot :
Bonjour,
Développer puis réduire :
C = (2x+5)(3x+7)
C = 2x×3x+2x×7+5×3x+5×7
C = 6x²+2x×7+5×3x+5×7
C = 6x²+14x+5×3x+5×7
C = 6x²+14x+15x+5×7
C = 6x²+14x+15x+35
C = 6x²+29x+35
L = (y+3)(y-3)
L = y×y-3y+3y-3×3
L = y²-3y+3y-3×3
L = y²-3y+3y-9
L = y²-9
M = (2x+5)(2x-5)
M = 2x×2x-2x×5+5×2x-5×5
M = 4x²-2x×5+5×2x-5×5
M = 4x²-10x+5×2x-5×5
M = 4x²-10x+10x-5×5
M = 4x²-10x+10x-25
M = 4x²-25
D = (2x-5)(3x-2)
D = 2x×3x-2x×2-5×3x-5(-2)
D = 6x²-2x×2-5×3x-5(-2)
D = 6x²-4x-5×3x-5(-2)
D = 6x²-4x-15x-5(-2)
D = 6x²-4x-15x+10
D = 6x²-19x+10
Bonne journée.
Bonjour
Développer et réduire les expressions suivantes :
C = (2x + 5)(3x + 7)
C = 6x² + 14x + 15x + 35
C = 6x² + 29x + 35
L = (y + 3)(y - 3)
L = y² - 3y + 3y - 9
L = y² - 9
M = (2x + 5)(2x - 5)
M = 4x² - 25
D = (2x - 5)(3x - 2)
D = 6x² - 4x - 15x + 10
D = 6x² - 19x + 10.