Without graphing, state whether each function has a maximum or a minimum. Then, write each function in the form y= a(x-h) +k and find the minimum or maximum value and the value of x for which it occurs.
a. y= 3x²-18x+1
b. y= -4x²-32x-11
c. y= -7x²+84x+19
d. y= 4x²+20x+7



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