Réponse :
Explications étape par étape
2x³ + 5x² - 3x - 4
f( -1/3) = 2 ( -1/3)³ + 5 (-1/3)² - 3 (-1/3 ) - 4
⇔ f( -1/3) = 2 ( - 1 /27 ) + 5 ( 1/9) + 3/3 - 4
⇔ f( -1/3) = -2/27 + 5/9 + 1 - 4
⇔ f( -1/3) = -2/27 + 5/9 -3
⇔ f( -1/3) = ( - 2 + 15 - 81 ) / 27
⇔ f( -1/3) = -68/27