Answer
$9a^{6}$
Work Step by Step
$(2a^{3})^{3}a^{-3}+a^{11}a^{-5}=2^{3}a^{3\times3}a^{-3}+a^{11}a^{-5}=8a^{9}a^{-3}+a^{11}a^{-5}=8a^{9+(-3)}+a^{11+(-5)}=8a^{6}+a^{6}=9a^{6}$
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