1) and

Using the definition of absolute value of x as a piecewise function, the intersects are -3 and 3.

But that can't be right....

2) and

This one I think i could do if I could get started. But I keep end up having to find the square root of 1/7, which I can't seem to figure out how to express as a fraction. Maybe just a may problem, but I don't know.