Write the vertex of the following function as $\left( x,y \right)$ :

$f\left( x \right) ={ 3x }^{ 2 }$

Find $x+y$

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Check out the set:
2016 Problems
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The answer is 0.

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Vertex x coord = -b/2a= -0/6=0 y=3x^2 =0. (X,y)=(0,0) X+y = 0