The problem
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what is the function minimum or maximum value?
Answer provided by our tutors
General functional notation (e.g. f(x) ) is not supported. If you wish to draw a function such as f(x) = x2, replace f(x) with y (or any other unused variable).
So in you case, if you can see the minimum and maximum by graphing the function:
y=-3x^2+30x-71
The maximum is 'y = 4'.
There is no minimum.