Evaluate
\frac{\left(14a+3\right)^{2}}{49}
Expand
4a^{2}+\frac{12a}{7}+\frac{9}{49}
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4a^{2}+\frac{12}{7}a+\frac{9}{49}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(2a+\frac{3}{7}\right)^{2}.
4a^{2}+\frac{12}{7}a+\frac{9}{49}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(2a+\frac{3}{7}\right)^{2}.
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