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--> 64-4(-1)(-12)/-4(-1) = 64-48/4 = 16/4 = 4
--> titik maksimumnya = (-b/2a , b2-4ac/-4a) --> (-8/-2 , 4 ) --> (4,4)
maksimum saat f ' (x) = 0
- 2x + 8 = 0
x = 4
f(-4) = - (-4)² + 8(4) - 12
= - 16 + 32 - 12
= 4
jadi maksimum di (4,4)