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y' = x³ - 9x
Maka,
Stasioner:
0 = x³ - 9x
x(x²-9) = 0
x(x+3)(x-3) = 0
Maka,
x = -3, x = 0 dan x = 3
Maka, substitusikan:
f(-3) = -81/4
f(0) = 0
f(9) = -81/4
Yang niminum adalah -81/4 yang dimiliki:
(-3,-81/4) dan (3,-81/4)