Washer method: revolving around other axes

Let $R$R be the region enclosed by the curves $y=\sqrt x$y, equals, square root of, x, end square root and $y=\dfrac x3$y, equals, start fraction, x, divided by, 3, end fraction.

A solid is generated by rotating $R$R about the line $x=-1$x, equals, minus, 1.