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
