Evaluate
\left(3m+n\right)\left(6m+n\right)
Expand
18m^{2}+9mn+n^{2}
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18m^{2}+6mn+3nm+n^{2}
Apply the distributive property by multiplying each term of 6m+n by each term of 3m+n.
18m^{2}+9mn+n^{2}
Combine 6mn and 3nm to get 9mn.
18m^{2}+6mn+3nm+n^{2}
Apply the distributive property by multiplying each term of 6m+n by each term of 3m+n.
18m^{2}+9mn+n^{2}
Combine 6mn and 3nm to get 9mn.
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