Let f(x)=x−4x+8. Find the open intervals on which f is increasing (decreasing). Then determine the x-coordinates of all relative maxima (minima). 1. f is increasing on the intervals none equation editorEquation Editor 2. f is decreasing on the intervals none equation editorEquation Editor 3. The relative maxima of f occur at x = None equation editorEquation Editor 4. The relative minima of f occur at x = None equation editorEquation Editor Notes: In the first two, your answer should either be a single interval, such as (0,1), a comma separated list of intervals, such as (-inf, 2), (3,4), or the word "none". In the last two, your answer should be a comma separated list of x values or the word "none".