Verified Answer :

all of the above sounds about right ;-;

olemakpadu

Maximum or minimum value for a quadratic function:

y = -2x² + 4x - 1,    a = -2, b = 4, c = -1

y\(_{min or max}\) =  (4ac - b²)/4a    
 
                                          =   (4(-2)(-1) - 4²) / 4(-2)
                                      
                                           =    (8 - 16) /-8 =   -8/-8 = 1.

Since  the value it positive, it is a maximum.

C.  1

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