Find the coefficient of \(x^2\) in the expansion of \(\left( x + \frac{2}{x} \right)^6\).
Solution
To find the coefficient of \(x^2\) in the expansion of \(\left( x + \frac{2}{x} \right)^6\), we use the binomial theorem.
The general term in the expansion is given by:
\(T_k = \binom{6}{k} \left(x\right)^{6-k} \left(\frac{2}{x}\right)^k\)
We need the term where the power of \(x\) is 2:
\((6-k) - k = 2\)
\(6 - 2k = 2\)
\(2k = 4\)
\(k = 2\)
Substitute \(k = 2\) into the general term:
\(T_2 = \binom{6}{2} \left(x\right)^{6-2} \left(\frac{2}{x}\right)^2\)
\(= \binom{6}{2} x^4 \cdot \frac{4}{x^2}\)
\(= \binom{6}{2} \cdot 4 \cdot x^2\)
\(= 15 \cdot 4 \cdot x^2\)
\(= 60x^2\)
Thus, the coefficient of \(x^2\) is 60.
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