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Sagot :

bjr

f(x) = -x² - x

a.  x = 6                          (on écrit 6 à la place de la lettre x)

f(x) =  -x²  - x

f(6) = - 6² - 6             ( - 6² = - 6*6 = -36 //   - 6² = -(6²) )  

      = -36 - 6

      = - 42

b. x = -10

f(-10) = - (-10)² - (-10) = -(100) + 10 = -90

c. x = 2/7

f(2/7 = -(2/7)² - 2/7) = -4/49 - (2 x 7)/7 x 7) = -4/49 -14/49 = -18/49

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