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Tentukan derivasinya:
y' = x² - x - 1
Dengan y' = m = 1
Maka,
1 = x² - x - 1
x² - x - 2 = 0
(x+1)(x-2) = 0
x = -1 dan x = 2
Substitusikan pada fungsi, didapat:
f(-1) = -1/3 - 1/2 + 1 - 1 = -5/6
f(2) = 8/3 - 2 - 2 - 1 = -7/3
Ordinatnya:
-5/6 dan -7/3