$$( - 3 x ^ { 2 } ) \times 4 x \times ( - x )$$
$12x^{4}$
$$-3x^{3}\times 4\left(-x\right)$$
$$-12x^{3}\left(-x\right)$$
$$12x^{3}x$$
$$12x^{4}$$
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$48x^{3}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-3x^{3}\times 4\left(-x\right))$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-12x^{3}\left(-x\right))$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(12x^{3}x)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(12x^{4})$$
$$4\times 12x^{4-1}$$
$$48x^{4-1}$$
$$48x^{3}$$
