Expand
21a^{2}-8ab-4b^{2}
Evaluate
\left(3a-2b\right)\left(7a+2b\right)
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21a^{2}+6ab-14ba-4b^{2}
Apply the distributive property by multiplying each term of 3a-2b by each term of 7a+2b.
21a^{2}-8ab-4b^{2}
Combine 6ab and -14ba to get -8ab.
21a^{2}+6ab-14ba-4b^{2}
Apply the distributive property by multiplying each term of 3a-2b by each term of 7a+2b.
21a^{2}-8ab-4b^{2}
Combine 6ab and -14ba to get -8ab.
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