For this we can observe term -3x^5 because it is x to power of 5 and for bit larger values of x in positive direction and x in negative direction it is dominant that other terms.
if x decreases because power 5 is odd, x^5 will be negative and when multiplied by -3 it will be positive so it will rise to the left steaper and steaper.
if x increases, x^5 increases quickly and when multiplied by -3 will be negative. which means that it falls to the right.
