A = (2x+1) (1-3x) - 2 (2x+1)
développer
A = 2x*1 + 2x*(-3x) + 1*1 + 1*(-3x) - 2*2x - 2*1
= 2x - 6x² + 1 - 3x - 4x - 2
= -6x² - 5x - 1
factoriser
= (2x+1) (1-3x-2)
= (2x+1) (-3x-1)
A(-1) = -6*(-1)² - 5*(-1) - 1 = -6 + 5 - 1 = -2
Réponse :
Explications étape par étape
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A = (2x+1) (1-3x) - 2 (2x+1)
développer
A = 2x*1 + 2x*(-3x) + 1*1 + 1*(-3x) - 2*2x - 2*1
= 2x - 6x² + 1 - 3x - 4x - 2
= -6x² - 5x - 1
factoriser
A = (2x+1) (1-3x) - 2 (2x+1)
= (2x+1) (1-3x-2)
= (2x+1) (-3x-1)
A(-1) = -6*(-1)² - 5*(-1) - 1 = -6 + 5 - 1 = -2
Réponse :
Explications étape par étape
A = (2x+1) (1-3x) - 2 (2x+1)
développer
A = 2x*1 + 2x*(-3x) + 1*1 + 1*(-3x) - 2*2x - 2*1
= 2x - 6x² + 1 - 3x - 4x - 2
= -6x² - 5x - 1
factoriser
A = (2x+1) (1-3x) - 2 (2x+1)
= (2x+1) (1-3x-2)
= (2x+1) (-3x-1)
A(-1) = -6*(-1)² - 5*(-1) - 1 = -6 + 5 - 1 = -2