The roots of f(x) are the values for x at which f(x)=zero. The root of f(x) at point P is a bit redundant, since point P is the root of the function (and based on the graph, the only root).
We could plug zero in for f(x) to find the value of x at Point P, but based on the graph/options provided and the complexity of the function, it may be easier to just eyeball the graph to get the correct answer. We see that point P is between 1/2 and 1 on the x-axis.
Of the options provided, we want the value for x that satisfies: 1/2 < x < 1
a) 1/2 < 3/5 < 1 CORRECT ANSWER
b) 1/5 < 1/2 INCORRECT
c) 5/3 > 1 INCORRECT
d) 1/3 < 1/2 INCORRECT
