Answer
$a^{5}$(31a$b^{3}$+63)
Work Step by Step
Given: 31$a^{6}$$b^{3}$+63$a^{5}$
The GCF of this expression is :$a^{5}$
We factor out GCF to attain:
$a^{5}$(31a$b^{3}$+63)
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