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We want to draw the graph of the given function, which has the form $y=x^2+k,$ where $k$ is either a positive or a negative number. $\begin{gathered} y=x^2+3 \end{gathered}$ To do so, we will first draw the graph of its parent function, $y=x^2.$ Recall that the graph of $y=x^2$ is a parabola opening upwards, with vertex $(0,0),$ whose axis of symmetry is the vertical line $x=0,$ and passes through the points $(1,1)$ and $(\text{-} 1,1).$
Our function is a vertical translation of the parent function by $3$ units in the positive direction. Thus, we will translate the above graph $3$ units upwards.