Quelqu’un pourrai m’aider svp ( factorisation maths ) 41x² + 12 + 9 = 1+18x +81x² = x² + 2x +1 = 4x ² -12x+9 = X ² + 2x + 1 = 4 - x² = X ²-1 = 16x ²-49 = 64-100
Mathématiques
natachahassani2002
Question
Quelqu’un pourrai m’aider svp ( factorisation maths )
41x² + 12 + 9 =
1+18x +81x² =
x² + 2x +1 =
4x ² -12x+9 =
X ² + 2x + 1 =
4 - x² =
X ²-1 =
16x ²-49 =
64-100x² =
(x+1) ² - 16 , 49 - ( 2x+3) ² =
( 3x -1 ² ) - ( 2x + 9 ) ² =
41x² + 12 + 9 =
1+18x +81x² =
x² + 2x +1 =
4x ² -12x+9 =
X ² + 2x + 1 =
4 - x² =
X ²-1 =
16x ²-49 =
64-100x² =
(x+1) ² - 16 , 49 - ( 2x+3) ² =
( 3x -1 ² ) - ( 2x + 9 ) ² =
1 Réponse
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1. Réponse mariejoe57
Réponse :
bonjour
Explications étape par étape :
41x² + 12 + 9 = erreur d'énoncé ?
1+18x +81x² = (9x-1)² (identité remarquable : a²+2ab+b²=(a+b)²
x² + 2x +1 = (x+1)²
4x ² -12x+9 =(2x-3)²
X ² + 2x + 1 =(x+1)²
4 - x² = (2-x)(2+x) (identité remarquable a²-b²= (a-b)(a+b)
X ²-1 = (x-1)²
16x ²-49 = (4x+7)(4x-7)
64-100x² =(8-10x) (8+10x)
(x+1) ² - 16 = (x+1-4)(x+1+4)=( x-3)(x+5)
49 - ( 2x+3) ² = (7-2x-3) (7+2x+3) = (4-2x) (10+2x)
( 3x -1 )² - ( 2x + 9 ) ² = (3x-1-2x-9) (3x-1+2x+9) =(x-10) (5x+8)