Consider the function: f(x) = -9x2 - 8x- 1 Step 1 of 2: Determine the intervals on which the function is concave upwards or concave downwards. Answer Keypad Keyboard Shortcuts Separate multiple entries with a comma. Selecting a radio button will replace the entered answer value(s) with the radio button value. If the radio button is not selected, the entered answer is used. Concave Up: a Never Concave Up Concave Down: O Never Concave Down