This is Section 3.3 Problem 26(j):The function y=f(x) is represented by the graph in the textbook. Use the graph to find points or intervals that satisfy the following conditions. The answers should be in ascending order of x values and either be an integer or an integer and a half such as "1.5". Use "DNE" if such interval does not exist.(j) Determine the interval(s) on which f is concave down.Answer: (,) and (,) and (,and (,) and (,).This is Section 3.3 Problem 26(j):The function y=f(x) is represented by the graph in the textbook. Use the graph to find points or intervals that satisfy the following conditions. The answers should be in ascending order of x values and either be an integer or an integer and a half such as "1.5". Use "DNE" if such interval does not exist.(j) Determine the interval(s) on which f is concave down.Answer: (,) and (,) and (,and (,) and (,).