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f(x) = -2x^2 + 18x
a. find vertex and determine whether it is a max or minimum
b. find zeros
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a. At vertex
At x=9/2, y=40.5
So vertex is (9/2, 40.5)
At vertex d2(f(x))/dx2=-4 <0
Hence it is maximum
b. Zeroes are f(x)=0
Zeroes are x=0,9
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