$$-2x^{2}\times(-7x^{2})$$
$14x^{4}$
$$-2x^{4}\left(-7\right)$$
$$14x^{4}$$
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$56x^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-2x^{4}\left(-7\right))$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(14x^{4})$$
$$4\times 14x^{4-1}$$
$$56x^{4-1}$$
$$56x^{3}$$
