Réponses

2013-03-24T17:35:28+01:00

Si t = 3, alors :

A = 3t² + 6t - 8 

A = 3*3² + 6*3 - 8

A = 3*9 + 18 - 8

A = 27 + 10

A = 37

 

Si x = - 2 alors :

B = 5x² - 3x + 7

B = 5*(-2)² - 3*(-2) + 7

B = 20 + 6 + 7

B = 33

 

Si y = - 3 alors

C = - 3y² - 5y - 8  

C = - 3 *(-3)² - 5*(-3) - 8

C = - 27 + 15 - 8

C = -20

2013-03-24T17:40:12+01:00

A = 27+18-8 = 37

B = 20 +6+7 = 33

C = -27 +15-8 = -20