Answer
$|2a+b|$
Work Step by Step
Using $\sqrt{x^2}=|x|$, the given expression, $
\sqrt[1976]{(2a+b)^{1976}}
,$ simplifies to
\begin{array}{l}
|2a+b|
.\end{array}
We put the variables in absolute value bars since they are both being raised to an odd power.