$$5 a \times 4 a$$
$20a^{2}$
$$5a^{2}\times 4$$
$$20a^{2}$$
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$40a$
$$\frac{\mathrm{d}}{\mathrm{d}a}(5a^{2}\times 4)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(20a^{2})$$
$$2\times 20a^{2-1}$$
$$40a^{2-1}$$
$$40a^{1}$$
$$40a$$
