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titik balik x= -b/2a
2= -b/2a
-b = 2x2a
b = -4a
(2,7)
7=4a+2b+c
7=4a+2(-4a)+c
7=4a-8a+c
7= -4a+c
(4,15)
15=16a+4b+c
15=16a+4(-4a)+c
15=16a-16a+c
c=15
7=-4a+c
7=-4a+15
-4a=7-15
-4a=-8
a=2
b=-4a
b=-4(2) = -8
y=2x² -8x + 15