To find the vertex of the parabola,put
put x=0 we get y=27
put x=1 we get y=18
put x=6 we get y=3
put x=7 we get y=6
(0,27)and (1,18) are two points on one side of the vertex while
(6,3)and (7,6) are two more points on other side of the vertex
Now we can easily plot the curve
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