SOLUTION: Determine the vertex of the function y=4x-x^2

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Question 1073021: Determine the vertex of the function y=4x-x^2
Answer by ikleyn(52855) About Me  (Show Source):
You can put this solution on YOUR website!
.
4x+-+x%5E2 = -%28x%5E2-4x%29 = -%28x%5E2+-+4x+%2B+4%29+%2B+4 = -%28x-2%29%5E2%2B4.

The vertex is (x,y) = (2,4).


graph%28+330%2C+330%2C+-5.5%2C+6.5%2C+-8.5%2C+6.5%2C%0D%0A++++++++++-x%5E2+%2B+4x%0D%0A%29

Plot y = -x%5E2+%2B+4x