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Write down what you know about the co-ordinates of each of the points A, B and C in turn.
Post, what you find.
 
The line y= mx+ c has nothing to do with A and C! A is the highest point on the parabola. Since a number, squared, is never negative, what is the largest possible value of 18- 2x2? At C, x is positive and f(x) is 0. 18- x2= 0 has two roots. What is the positive one?
 
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