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a^{2}+12
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a^{2}+12
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a^{2}+12a+36-12\left(a+2\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+6\right)^{2}.
a^{2}+12a+36-12a-24
Use the distributive property to multiply -12 by a+2.
a^{2}+36-24
Combine 12a and -12a to get 0.
a^{2}+12
Subtract 24 from 36 to get 12.
a^{2}+12a+36-12\left(a+2\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+6\right)^{2}.
a^{2}+12a+36-12a-24
Use the distributive property to multiply -12 by a+2.
a^{2}+36-24
Combine 12a and -12a to get 0.
a^{2}+12
Subtract 24 from 36 to get 12.
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