Can you point out an x such that the distance from x to 1, i.e., |x - 1|, is 0.2 and the distance from f(x) to f(1), i.e., |f(x) - f(1)|, is greater than 0.2?
Edit: Changed |f(x) - f(x)| into |f(x) - f(1)|.
I fixed a typo in post #2.
The question is as simple as it goes. I don't see how to simplify it. I would invite you to show the exact phrase you don't understand or otherwise describe your difficulty.
Perhaps you can answer the following questions.
Do you understand that the distance between two points (x1, 0) and (x2, 0) along the x-axis is |x1 - x2|? Similarly, the distance between (0, y1) and (0, y2) along the y-axis is |y1 - y2|.
What is f(1.2) approximately?
What is the approximate distance between f(1.2) and f(1), i.e., what is |f(1.2) - f(1)|?