I have this problem and I really need someone else to look at it and see if the answers are correct problem: use the graphing strategy to sketch the graph of y=(4x)/(x^2+1). check for domain values, intercepts, critical values, interval where the function is increasing and where it is decreasing. Then graph it. please use sign charts. domain: (-infinity, +infinity) x intercept: is where y = 0 : (0, 0) y intercept: is where x = 0 : (0, 0) critical value y' = (4-4x^2)/(x^2+1)^2 = 0 solving for x gives us x = +- 1 so the critical values are x = 1 and x = -1 using the sign charts interval where function is increasing: (-1, 1) interval where function is decreasing: (-infinity, -1) & (1, infinity) Can someone verify these answers please.