math
3a^2b + 6a^2b
9a^4b^2
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The expression is 9a^4b^2 because when two terms have the same base, you can add the exponents. In this case, both terms have the base "a" with exponents of 2, so you can add the exponents to get 4. Both terms also have the base "b" with exponents of 1, so you can add the exponents to get 2. Thus, the expression is 9a^4b^2.
