By Rational Root Thoeorem,
q = +-1 and p = +-1, +-2, +-4.
So the possible roots are, p/q = +-1, +-2, +-4.
To test which roots are actual roots, simply plug these values into x, and see which ones of them output 0. After some easy calculation, only x = 2 and x = -2 will make f(x) outputs 0.
To find y intercept, set x to 0, f(x) = -4.
As for the end points behavior, since the highest term is +, and the power is even, meaning that the ends are both going to positive infinity.
