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Sagot :

AYUDA

bjr

E(x) =  3x² - 2x + 7

E(-5) = 3 * (-5)² - 2 * (-5) + 7 = 3 * 25 + 10 + 7 .. tu peux finir

et

E(4/5) = 3 * (4/5)² - 2*4/5 + 7 = 3 * 9/25 - 8/5 + 7

          = 27/25 - 40/25 + 35/5

          = 22/5 = 4,4

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