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1) developper puis reduire l'expression 2)tester la reponse pour deux valeurs de x C=(8-4x) (6x-5)

Sagot :

C = ( 8 - 4x ) ( 6x - 5 )

C = 48x - 40 - 24x² - 20x

C = - 24x² + 28x - 40

 

Si x = 0 ,

C = - 24*0² + 28*0 - 40

C = -40

 

Si x = 1,

C = - 24*1² + 28*1 - 40

C = - 24 + 28 + -40

C = - 36

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