it's a simple one-variable function to investigate...
you can open it to
and then derivate it .
comparing the derivative to 0 will find extrema
and since the function is well defined for all x, this is the only
extrema.
intercept with x axis is in the two roots which are conviniently
shown to you
and with y axis is simply (put 0 instead of x)
it is symmetrical, and the symmetry axis is the straight line , since it is a squre function.
and there are no asymptotes here, since the function is well defined
for all x, and no asymptote as x--->infinity because it is a square function.
that's all, you need to focus your question to the part you're having
trouble with, because i'm not sure which one i needed to answer,
and if, at all, i've answered your question.