1. Given the functionf(x) = x^3-2x,sketchy = f(|x|)

2. Sketchg(x) = |x^2-1| - |x^2-4|

3. Sketch the region in the plane to show all points (x,y) such that|x|+|y|<=2

I need help understanding absolute values, cause i plugged in table of values to get y but my teacher says I have to consider the cases and regions which I don't understand. Please help asap.