Bonjour,
A = ( x + 2 ) ( + 3 )
= 3 ( x + 2 )
= 3x + 6
>B = ( x - 7 ) ( 3x - 2 )
= 3x² - 2x - 21x + 14
= 3x² - 23x + 14
C = ( 1 + 2x ) ( 3 - x )
= 3 - x + 6x - 2x²
= -2x² + 5x + 3
Bonne journée
Bonjour
Développer et réduire les expressions suivantes :
A = (x + 2) (x + 3) (j’ai supposé x + 3 ??)
A = x * x + x * 3 + 2 * x + 2 * 3
A = x^2 + 3x + 2x + 6
A = x^2 + 5x + 6
B = (x-7)(3x - 2)
B = x * 3x - x * 2 - 7 * 3x - 7 * (-2)
B = 3x^2 - 2x - 21x + 14
B = 3x^2 - 23x + 14
C = (1 + 2x)(3-x)
C = 1 * 3 - 1 * x + 2x * 3 - 2x * x
C = 3 - x + 6x - 2x^2
C = -2x^2 + 5x + 3