Exercice 4 Développer et réduire chacune des expressions littérales suivantes :
A = x x 7 x
B = 8x x 9 x
C = 9+ (-3x + 1) × (-2x + 1)
D = (-9x - 10) x (3x-4) +6x²
E = 9x +9+ (5x-5) × (-5x+7)
svp j'ai besoin d'aide.
A = x x 7 x
B = 8x x 9 x
C = 9+ (-3x + 1) × (-2x + 1)
D = (-9x - 10) x (3x-4) +6x²
E = 9x +9+ (5x-5) × (-5x+7)
svp j'ai besoin d'aide.
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bonjour
A = x * 7 x = 7 x²
B = 8x * 9 x = 72 x²
C = 9+ (-3x + 1) × (-2x + 1)
9 + ( 6 x² - 3 x - 2 x + 1 )
= 9 + 6 x² - 5 x + 1
= 6 x² - 5 x + 10
D = (-9x - 10) x (3x-4) +6x²
= - 27x² + 36 x - 30 x + 40 + 6 x²
= - 21 x² + 6 x + 40
E = 9x +9+ (5x-5) × (-5x+7)
= 9 x + 9 + ( - 25 x² + 35 x + 25 x - 35 )
= 9 x + 9 - 25 x² + 60 x - 35
= - 25 x² + 69 x - 26