Answer
$a^2b^3c^4\sqrt b$
Work Step by Step
$\sqrt (a^4b^7c^8)$ = $\sqrt a^4\times\sqrt b^7\times\sqrt c^8)$ = $\sqrt a^2\times\sqrt a^2 \times\sqrt b^3\times\sqrt b^3\times\sqrt b\times\sqrt c^4\times\sqrt c^4)$ = $a^2b^3c^4\sqrt b$
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