Réponse :
Bonsoir
Explications étape par étape
A = -( -x + 8 ) ( x + 5 )
A = - (-x*x-x*5+8*x+8*5)
A = - (-x^2-5x+8x+40)
A = x^2+5x-8x-40
A = x^2 -3x -40
B = ( 2x -1 ) ( -3x -7 )
B = 2x*(-3x)+2x*(-7)-1*(-3x)-1*(-7)
B = -6x^2 - 14x + 3x + 7
B = -6x^2 - 11x +7
premier calcul
-( -x+8 ) ( x + 5 )
= -( -x² -5x + 8x + 40 )
= -( -x² +3x +40 )
= x² -3x - 40
second calcul
( 2x -1 ) ( -3x -7 )
= -6x² -14x +3x +7
= - 6x² - 11x +7
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Verified answer
Réponse :
Bonsoir
Explications étape par étape
A = -( -x + 8 ) ( x + 5 )
A = - (-x*x-x*5+8*x+8*5)
A = - (-x^2-5x+8x+40)
A = x^2+5x-8x-40
A = x^2 -3x -40
B = ( 2x -1 ) ( -3x -7 )
B = 2x*(-3x)+2x*(-7)-1*(-3x)-1*(-7)
B = -6x^2 - 14x + 3x + 7
B = -6x^2 - 11x +7
Réponse :
premier calcul
-( -x+8 ) ( x + 5 )
= -( -x² -5x + 8x + 40 )
= -( -x² +3x +40 )
= x² -3x - 40
second calcul
( 2x -1 ) ( -3x -7 )
= -6x² -14x +3x +7
= - 6x² - 11x +7