Answer
$\log x^{18}$
Work Step by Step
since, we have $\sum_{i=2}^4 (2i) \log x$
Thus,
$\sum_{i=2}^4 (2i) \log x= 4 \log x+ 6 \log x+8 \log x$
or, $=18 \log x$
or, $=\log x^{18}$
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