f(x) = 8x2 x+ 3 Step 1 of 2: Determine the intervals on which the function is concave upwards or concave downwards. a Keypad Keyboard Shortcuts Answer 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: 5 Never Concave Up Con av ' A c e Down. Never Concave Down