Factoriser (^2= au carré)A=3x^2 +2x + (3x+2)^2B=(4x+3)^2 - 4x - 3C=(x-5) (2x+3)-x^2 +25.... Pergunta de ideia degruffazanais

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Factoriser (^2= au carré)

A=3x^2 +2x + (3x+2)^2

B=(4x+3)^2 - 4x - 3

C=(x-5) (2x+3)-x^2 +25

Bonjour,

Explications étape par étape :

A = 3x² + 2x + (3x + 2)²

A = x(3x + 2) + (3x + 2)²

A = (3x + 2)(x + 3x + 2)

A = (3x + 2)(4x + 2)

B = (4x + 3)² - 4x - 3

B = (4x + 3)² + (- 4x - 3)

B = (4x + 3)² - (4x + 3)

B = (4x + 3)(4x + 3 - 1)

B = (4x + 3)(4x + 2)

C = (x - 5)(2x + 3) - x² + 25

C = (x - 5)(2x + 3) - (x² - 5²)

C = (x - 5)(2x + 3) - (x - 5)(x + 5)

C = (x - 5)(2x + 3 - x - 5)

C = (x - 5)(x - 2)

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