The figure below shows the graph of a quadratic function y = ƒ(x).
(a) What is the maximum value of ƒ(x)?
(b) For what value of x is ƒ(x) a maximum?
(c) How many real solutions are there of the equation ƒ(x) = 2?
(d) How many real solutions are there of the equation ƒ(x) = 6?
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