Determine the intervals on which the graph of ? =?(?) is concave up or concave down, and find the?-values at which the points of inflection occur.
?(?)=? (? − 9 √x),? > 0
(Enter an exact answer. Use symbolic notation and fractionswhere needed. Give your answer in the form of a comma separatedlist, if necessary. Enter DNE if there are no points ofinflection.)
? =
(Use symbolic notation and fractions where needed. Give youranswers as intervals in the form (∗,∗).
Use the symbol ∞ for infinity, ∪ for combining intervals, and anappropriate type of parenthesis \"(\", \")\", \"[\", or \"]\", depending onwhether the interval is open or closed. Enter ∅
if the interval is empty.)
? is concave up when ?∈
? is concave down when ?∈
