Question 362554
This quadratic is in vertex form, {{{y=a(x-h)^2+k}}}.
The max/min value occurs at the vertex ({{{0}}},{{{3}}}).
Since this parabola opens upwards {{{a>0}}}, the minimum value occurs at the vertex.
{{{y>=3}}}
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{{{drawing(300,300,-10,10,-5,15,grid(1),circle(0,3,0.3),graph(300,300,-10,10,-5,15,x^2+3,3))}}}