What is the value of c so that x² – 11x + c is a perfect-square trinomial? The choices that i get are a) 121 b) 121/4 c) -11/2 d) 121/2 I've tried everyone of them and they don't make any sense. 4/3/2013 | Brittani from Martinsville, IN | 2 Answers | 0 Votes