Answer
$$6a^3+12a^2-20a. $$
Work Step by Step
By multiplying each term of the polynomial by the monomial, and then adding the products, we have
$$2a(3a^2+6a-10)=2a(3a^2)+2a(6a)+2a(-10) \\
=6a^3+12a^2-20a. $$
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