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przechodzi przez punkty;
A=(1;4)
B=(4;4)
C=(5;12)
y=a x² + b x + c
4=a+b+c→→c=4-a-b
4=16a+4b+c
12=25a+5b+c
4=16a+4b+4-a-b
12=25a+5b+4-a-b
0=15a+3b /*4
8=24a+4b /*(-3)
0=60a+12b
-24=-72a-12b
---------------
-24=-12a
a=2
3b=-15*2
3b=-30
b=10
c=4-2-10=-8
y=2 x² +10 x -8