$$- \frac{ 1 }{ 2 } x \times 4x$$
$-2x^{2}$
$$-\frac{1}{2}x^{2}\times 4$$
$$\frac{-4}{2}x^{2}$$
$$-2x^{2}$$
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$-4x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-\frac{1}{2}x^{2}\times 4)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{-4}{2}x^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-2x^{2})$$
$$2\left(-2\right)x^{2-1}$$
$$-4x^{2-1}$$
$$-4x^{1}$$
$$-4x$$
