3-t Let F(x) = √² + 40 (a) Find the value of a where F obtains its maximum value. x = dt for -∞0 < x < +∞o (b) Find the intervals over which is only increasing or decreasing. Use interval notation using U for union and enter "none" if no interval. Intervals where F is increasing: Intervals where I' is decreasing: (c) Find open intervals over which is only concave up or concave down. Use interval notation using U for union and enter "none" if no interval. Intervals where F is concave up: Intervals where is concave down:

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