Answer
$14ab\sqrt {30b}$
Work Step by Step
Rewrite radicands to separate out perfect squares:
$7\sqrt {4 • 30 • a^2 • b^2 • b}$
Take the square root of any perfect squares:
$7 • 2 • a • b\sqrt {30b}$
Multiply the coefficients:
$14ab\sqrt {30b}$
