Answer
$a^{2}b+2ab^{2}-17b$
Work Step by Step
$(a^{2}b+5ab^{2}-9b)-(3ab^{2}+8b)$
$=a^{2}b+5ab^{2}-9b-3ab^{2}-8b$
$=a^{2}b+5ab^{2}-3ab^{2}-9b-8b$
$=a^{2}b+2ab^{2}-17b$
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