Answer:
9b³
Explanation:
The 2 terms are like terms and can be combined, that is
b³ ( 1 + 8)
= 9b³
9a^4b^3
a^4b^3 + 8a^4b^3
These are like terms so we can add them together
Factor out a^4b^3
a^4b^3( 1+8)
a^4b^3 (9)
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b³b³ ( 1 + 8)b³