Expand
20a^{3}+28a^{2}+13a+2
Evaluate
\left(5a+2\right)\left(2a+1\right)^{2}
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\left(5a+2\right)\left(4a^{2}+4a+1\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(2a+1\right)^{2}.
20a^{3}+28a^{2}+13a+2
Use the distributive property to multiply 5a+2 by 4a^{2}+4a+1 and combine like terms.
\left(5a+2\right)\left(4a^{2}+4a+1\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(2a+1\right)^{2}.
20a^{3}+28a^{2}+13a+2
Use the distributive property to multiply 5a+2 by 4a^{2}+4a+1 and combine like terms.
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