Odpowiedź:
f(x) = x² - 3 ; g(x) = - 2x + 4 ; h(x) = x³ - 2x - 1
a)
dla x = - 2
f(- 2) = (- 2)² - 3 = 4 - 3 = 1
g(- 2) = - 2 * (- 2) + 4 = 4 + 4 = 8
h(- 2) = (- 2)³ - 2 * (- 2) - 1 = - 8 + 4 - 1 = - 5
b)
dla x = 1 + 2 = 3
f(3) = 3² - 3 = 9 - 3 = 6
g(3) = - 2 * 3 + 4 = - 6 + 4 = - 2
h(3) = 3³ - 2 * 3 - 1 = 9 - 6 - 1 = 9 - 7 = 2
c)
dla x = - 2/3)
f(- 2/3) = (- 2/3)² - 3 = 4/9 - 3 = - 2 5/9
g(- 2/3) = - 2 * (- 2/3) + 4 = 4/3 + 4 = 1 1/3 + 4 = 4 1/3
h( - 2/3) = (- 2/3)³ - 2 * (- 2/3) - 1 = - 8/27 + 4/3 - 1 = - 8/27 + 36/27 - 1 =
= 28/27 - 1 = 1 1/27 - 1 = 1/27