SOLUTION: Find the constant term that should be added to make the following expression a perfect-square trinomial. x^2 + 18x I come up wtih x^2+2time9x+81 but I am not sure that this

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons -> SOLUTION: Find the constant term that should be added to make the following expression a perfect-square trinomial. x^2 + 18x I come up wtih x^2+2time9x+81 but I am not sure that this       Log On


   

Question 120821: Find the constant term that should be added to make the following expression a perfect-square trinomial.
x^2 + 18x
I come up wtih
x^2+2time9x+81 but I am not sure that this is correct.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You are correct. However, I would multiply 2 and 9x to get 18x


So your answer should look like: x%5E2%2B18x%2B81