Consider the function:f(x) = -9x - 72x+8Step 1 of 2: Find the critical values of the function. Separate multiple answers with commas.AnswerHow to enter your

Consider the function:f(x) = -9x² - 72x+8Step 1 of 2: Find the critical values of the function. Separate multiple answers with commas.AnswerHow to enter your answer (opens in new window)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.x =KeypacKeyboard ShortcuNone