Let f(x)=(7+4x)^(4) f(x) has one critical value at A= For x < A,f(x) is Select an answer hat() For x > A,f(x) is Question Help: Video Question 2 0//1 pt 5398 Details Consider the function f(x)=4x+2x^(-1). For this function there are four important open intervals: (-oo,A),(A,B),(B,C), and (C,oo) where A, and C are the critical numbers and the function is not defined at B. Find and. B and C For each of the following open intervat