$$-8 { x }^{ 9 } +4 { x }^{ 9 } -7 { x }^{ 9 }$$
$-11x^{9}$
$$-4x^{9}-7x^{9}$$
$$-11x^{9}$$
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$-99x^{8}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-4x^{9}-7x^{9})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-11x^{9})$$
$$9\left(-11\right)x^{9-1}$$
$$-99x^{9-1}$$
$$-99x^{8}$$
