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18n^{2}+8
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18n^{2}+8
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9n^{2}-12n+4+\left(3n+2\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3n-2\right)^{2}.
9n^{2}-12n+4+9n^{2}+12n+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3n+2\right)^{2}.
18n^{2}-12n+4+12n+4
Combine 9n^{2} and 9n^{2} to get 18n^{2}.
18n^{2}+4+4
Combine -12n and 12n to get 0.
18n^{2}+8
Add 4 and 4 to get 8.
9n^{2}-12n+4+\left(3n+2\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3n-2\right)^{2}.
9n^{2}-12n+4+9n^{2}+12n+4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(3n+2\right)^{2}.
18n^{2}-12n+4+12n+4
Combine 9n^{2} and 9n^{2} to get 18n^{2}.
18n^{2}+4+4
Combine -12n and 12n to get 0.
18n^{2}+8
Add 4 and 4 to get 8.
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