$$\pi n ^ { 2 } k - \frac { 1 } { 4 } \pi n ^ { 2 } Q$$
$\frac{\pi \left(4k-Q\right)n^{2}}{4}$
$$\frac{4\pi n^{2}k-\pi n^{2}Q}{4}$$
$$\pi n^{2}\left(4k-Q\right)$$
$$\frac{\pi n^{2}\left(-Q+4k\right)}{4}$$
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