1a. For the function f(x) = x-3x - 9x, find the intervals where it is increasing,...

 

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1a. For the function f(x) = x-3x - 9x, find the intervals where it is increasing, the intervals where it is decreasing, the local maxima and the local minima. 1b. For the same function as in (la), find the intervals where it is concave up, the intervals where it is concave down and the inflection points. 1a. For the function f(x) = x-3x - 9x, find the intervals where it is increasing, the intervals where it is decreasing, the local maxima and the local minima. 1b. For the same function as in (la), find the intervals where it is concave up, the intervals where it is concave down and the inflection points.