Question #efd74

1 Answer
ErmWhat
Sep 22, 2017

#(4,11)#

Explanation:

For a quadratic of the form #ax^2+bx+c#, the vertex is #(-b/(2a),(4ac-b^2)/(4a))# (Vertex Formula)

#a = -2#, #b = 16#, #c=-21#...
#(-16/(2(-2)),(4(-2)(-21)-(16)^2)/(4(-2)))=(16/4, (168-256)/-8)=(4, 88/8)=(4,11)#

The vertex is #(4,11)#.

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