Sagot :
Bonjour,
1) A = (x + 3)(y + 2)
xy +2x +3y +6
B = (3-2x)(4 - x)
12 -3x -8x +2x²
2x² -11x +12
2) C = 2(3 + x)(3 - x)
(6 +2x)(3-x)
18 -6x +6x -2x²
-2x² +18
D = 2x(1 – x) - (x - 3)(3x + 2)
2x -2x² -(3x² +2x -9x -6)
2x -2x² -3x² -2x +9x +6
-5x² +9x +6
Bonjour
Développer et réduire si possible :
1) A = (x + 3)(y + 2)
A = xy + 2x + 3y + 6
B = (3-2x)(4 - x)
B = 12 - 3x - 8x + 2x²
B = 2x² - 11x + 12
2) C = 2(3 + x)(3 - x)
C = 2 (9 - 3x + 3x - x²)
C = 18 - 2x²
D = 2x(1 – x) - (x - 3)(3x + 2)
D = 2x - 2x² - (3x² + 2x - 9x - 6)
D = 2x - 2x² - 3x² - 2x + 9x + 6
D = - 2x² - 3x² + 2x - 2x + 9x + 6
D = - 5x² + 9x + 6.