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2x - 6 = 0
2x = 6
x= 3 ⇒ f(3) = 3² -6(3) - 7
= 9 - 18 - 7
= - 16
titik koordinatnya (3,-16) jenisnya merupakan titik balik maksimum
x² - 6x - 7 > 0
(x +1)(x-7) > 0
++++++ ----------- ++++++++
----------O------------O--------------
-1 7
Dikatakan fungsi naik jika x < -1 atau x >7 dan
Dikatakan funsi turun jika -1≤ x ≤ 7