The Binomial Theorem states that the expansion of \((a+b)^n\) is given by:
\[
\sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k
\]
For \((x+3)^7\), \(a = x\), \(b = 3\), and \(n = 7\). The general term \(T_{k+1}\) in the expansion is:
\[
T_{k+1} = \binom{7}{k} x^{7-k}
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