Answer
$\sqrt {a^2b^2} = ab$
Work Step by Step
By the formula in page 11,
$\sqrt {a^2b^2} = \sqrt {a^2} \sqrt {b^2}$
Because a and b are positive numbers,
$\sqrt {a^2} = a$ and $\sqrt {b^2} = b$.
Therefore,
$\sqrt {a^2b^2} = \sqrt {a^2} \sqrt {b^2} = ab$.
