$${ 2 }^{ 3 } \times { a }^{ 3 } \times 5 { a }^{ 4 }$$
$40a^{7}$
$$2^{3}a^{7}\times 5$$
$$8a^{7}\times 5$$
$$40a^{7}$$
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$280a^{6}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(2^{3}a^{7}\times 5)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(8a^{7}\times 5)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(40a^{7})$$
$$7\times 40a^{7-1}$$
$$280a^{7-1}$$
$$280a^{6}$$
