$$\frac{ 15 \times 14 \times 13 \times 12 \times 11 \times 10 \times 9 }{ 1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 } { x }^{ 15-7 }$$
$6435x^{8}$
$$5\times 9\times 11\times 13x^{15-7}$$
$$45\times 11\times 13x^{15-7}$$
$$495\times 13x^{15-7}$$
$$6435x^{15-7}$$
$$6435x^{8}$$
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$51480x^{7}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(5\times 9\times 11\times 13x^{15-7})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(45\times 11\times 13x^{15-7})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(495\times 13x^{15-7})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(6435x^{15-7})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(6435x^{8})$$
$$8\times 6435x^{8-1}$$
$$51480x^{8-1}$$
$$51480x^{7}$$
