=<0 We have four inflection points −5,−2,3,and9 For x<−5 all four terms (x+5),(x−3),(x−9),(x+2) will be negative. Hence, the overall expression will be positive. Similarly, when x>9, all four terms will be positive. When x belongs to (−2,3), two terms are negative and two are positive. Hence, the overall expression is positive again. We are left with the range (−5,−2) and (3,9) where the expression will be negative.