Réponses

2012-09-09T21:59:55+02:00

A = (5x + 3)(x - 4)

a

A = (5*(8/3)+3)*((8/3) - 4)

A = (40/3+9/3)*(8/3-12/3)

A = 49/3 * -4/3

A = -196/9

 

b

A = (5*((-5)/4)+3)*(((-5)/4) - 4)

A = (-25/4 + 12/4)(-5/4 - 16/4)

A = -13/4 * (-21/4)

A = 273/16

 

c

A = (5*((-2)/3)+3)*(((-2)/3) - 4)

A = (-10/3 + 3/3)(-2/3 - 12/3)

A = -7/3 * (-14/3)

A = 98/3

 

En espérant t'avoir aidé.