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Charlottez17
@Charlottez17
May 2019
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Bonjour pouvez vous m'aider je dois factoriser
A= 4x² + 36x + 81
B= 9x² -16
Merci d'avance!
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trudelmichel
Verified answer
Bonjour,
A=4x²+36x+81
remarque
4x²=(2x)²
81=9²
36x=2(2x*9)
d'où
A=(2x+9)²
B=-x²-16
remarque
9x²=(3x)²
16=4²
B=(3x)²-4²
B=(3x+4)(3x-4)
2 votes
Thanks 2
Quantum
Verified answer
Bonjour,
Identité remarquable :
a² + 2ab + b² = ( a+b )²
a² - b² = ( a+b )( a-b )
A) On remarque :
A = (2x)² + 2 × 2x × 9 + 9²
Tu conclus
B) On remarque :
B = (3x)² - 4²
Tu conclus
0 votes
Thanks 0
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Lista de comentários
Verified answer
Bonjour,A=4x²+36x+81
remarque
4x²=(2x)²
81=9²
36x=2(2x*9)
d'où
A=(2x+9)²
B=-x²-16
remarque
9x²=(3x)²
16=4²
B=(3x)²-4²
B=(3x+4)(3x-4)
Verified answer
Bonjour,Identité remarquable :
a² + 2ab + b² = ( a+b )²
a² - b² = ( a+b )( a-b )
A) On remarque :
A = (2x)² + 2 × 2x × 9 + 9²
Tu conclus
B) On remarque :
B = (3x)² - 4²
Tu conclus