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then you can make three equations by substituting for (x,y) as follows:
(i) (0,0) (ii) (1,2) (iii) (6,0)
That should be enough to work out a, b, and c.
Check by substituting each 'x' value into your finished equation to see if it gives the right 'y'.
i have a question where the curve is a parabola passing through the origin a point is given its neither the max nor min it`s on the curve the point is (1,2) and then the curve again cuts through the x axis at (6,0)