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27a^{2}-12b^{2}
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27a^{2}-12b^{2}
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27a^{2}+18ab-18ba-12b^{2}
Apply the distributive property by multiplying each term of 3a-2b by each term of 9a+6b.
27a^{2}-12b^{2}
Combine 18ab and -18ba to get 0.
27a^{2}+18ab-18ba-12b^{2}
Apply the distributive property by multiplying each term of 3a-2b by each term of 9a+6b.
27a^{2}-12b^{2}
Combine 18ab and -18ba to get 0.
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