what is the value of c so that x^2-11x+c is a perfect-square trinomial?
121
121/4
-11/2
121/2
To make x^2 - 11x + c a perfect-square trinomial, the value of c should be equal to half of the coefficient of x squared term, squared.
In this case, since the coefficient of x squared term is 1, the value of c would be (1/2)^2 = 1/4.
Therefore, the value of c is 1/4.