bonjour j'ai besoin d'aide pour cet exercice je ny arrive pas merci d'avance

Réponse :

Il faut utiliser les identités remarquables.

A = 16x² + 56x + 49

A = 4²*x² + 2*4*7 + 7²

A = (4x + 7)²

B = - (5x+7)²+1

B = 1²-(5x+7)²

B = [-(5x+7)+1] [-(5x+7)-1]

B = (-5x-7+1) (5x+7-1)

B = (-5x-8) (5x+6)

C = -(2x-1)(4x+3)+(5x-8)(4x+3)

C = (4x+3)[-(2x-1)+(5x-8)]

C = (4x+3)(3x-9)

D = -100x²+81

D = 81-100x²

D= 9²-(25x)²

D = (9+25x)(9-25x)

E = (6x + 2)² + (5x+1) (6x+2)

E = (6x + 2)(6x + 2)² + (5x+1)(6x+2)

E = (6x+2) [(6x+2) + (5x+1)]

E = (6x+2) (11x + 3)

F = (10x+3)(10x-10) + 10x-10

F = (10x+3)(10x-10) + (10x-10)*1

F = (10x-10)[(10x+3)+1]

F = (10x-10)( 10x+4)

EXERCICE 2

1. 3,809*10

2. 8,803*10000000

3. 3,30 * 10000000

4. 6,086 *1000

5. 1,3 *0,000001

6. 6,098 *10