## Intermediate Algebra for College Students (7th Edition)

$\log x^{18}$
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, $=\log x^{18}$