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8a+1
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8a+1
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4a^{2}+4a+1-4a\left(a-1\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(2a+1\right)^{2}.
4a^{2}+4a+1-4a^{2}+4a
Use the distributive property to multiply -4a by a-1.
4a+1+4a
Combine 4a^{2} and -4a^{2} to get 0.
8a+1
Combine 4a and 4a to get 8a.
4a^{2}+4a+1-4a\left(a-1\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(2a+1\right)^{2}.
4a^{2}+4a+1-4a^{2}+4a
Use the distributive property to multiply -4a by a-1.
4a+1+4a
Combine 4a^{2} and -4a^{2} to get 0.
8a+1
Combine 4a and 4a to get 8a.
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