*Cambridge Mathematics 4 Unit*textbook by Graham and Denise Arnold.

Remember that once you know the graph of $\displaystyle y=\sqrt{f(x)}$, then it is simply a matter of reflecting the square root curve in the $x$-axis to find the curve $\displaystyle y^2=f(x)$.

The reason for this is that if $\displaystyle y^2=f(x)$, then $\displaystyle y=\pm\sqrt{f(x)}$

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