Let f(x) = (4 + 3x) f (a ) has one critical value at A = For & > A, f(X) is Select an answerv Question Help: Video SubmitConsider the function f(x) = For this function there are two important intervals: 3x + 2 ( - oo, A) and ( A, oo) where the function is not defined at A. Find A For each of the following intervals, tell whether f (@) is increasing (type in INC) or decreasing (type in DEC). ( - 00, A): ( A, co) Note that this function has no inflection points, but we can still consider its concavity. For each of the following intervals, tell whether f(@) is concave up (type in CU) or concave down (type in CD). ( - 00, A): (A, 00)250 Consider the function f(@) = 4x + 0