$$\frac{ 240 }{ 20 } \times \frac{ 4 }{ x }$$
$\frac{48}{x}$
$$12\times \frac{4}{x}$$
$$\frac{12\times 4}{x}$$
$$\frac{48}{x}$$
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$-\frac{48}{x^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(12\times \frac{4}{x})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{12\times 4}{x})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{48}{x})$$
$$-48x^{-1-1}$$
$$-48x^{-2}$$
