The fields below accept a list of numbers or formulas separated by semicolons (e. g. 2; 4; 6 or x+1; x−1.) The order of the list does not matter. Enclose arguments of functions, numerators, and denominators in parentheses. For example, sin(2x) or (a−b)/(1+n). (a) Find all the x-values of the critical points and inflection points of the function f(x)=x4−2ax2+b. Assume a and b are positive constants. Critical points: Inflection points: (b) Find values of the parameters a and b if f has a critical point at the point (5,9). Enter the equation for f(x). f(x)= (c) If there is a critical point at (5,9),what are the x-values of the inflection points?