Solve x^2 - 3*|x| + 2 = 0.
x^2 -3lxl + 2 = 0 factor as
( l x l - 2 ) ( l x l - 1 ) = 0
So either or l x l - 1 = 0
lx l - 2 = 0 l x l = 1
x = 2, -2 x = -1, 1