What value must be added to the expression x2-3x to make it a perfect square trinomial

Answer: 9/4explanation: 1) given: x^2 - 3x2) a perfect square trinomial is the result of a binomial squared, for example:   (x + a)^2 = x^2 + 2xa + a^2so, since you have x^2 and - 3x, you have to add (3/2)^2.in that way you obtain x^2 - 3x + 9/4, which is (x - 3/2)^2.prove it: (x - 3/2)^2 = x^2 - 2 * x * (3/2) + (3/2)^2 = x^2 - 3x + 9/4. meaning that x^2 - 3x + 9/4 is a perfect square trinomial.so, you must add 9/4 to x^2 - 3x to make it a perfect square trinomial.