SOLUTION: Hi there, This problem isn't exactly quadratic equation, but it is part of a group of problems we are assigned working up to quadractic equations. In this problem, we need to

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Hi there, This problem isn't exactly quadratic equation, but it is part of a group of problems we are assigned working up to quadractic equations. In this problem, we need to      Log On


   

Question 785227: Hi there,
This problem isn't exactly quadratic equation, but it is part of a group of problems we are assigned working up to quadractic equations.
In this problem, we need to determine the value or values of d that complete the square for the expression:
x%5E2%2Bdx%2B9%2F4
I set it up as:
(d/2)^2=(+/-)sqrt(9/4)

and solved to get d(+/-)sqrt(9/4)
All of our homework is online and for some reason it's not accepting that answer. I was wondering if you could explain what I did wrong?
Thank you so much!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Take the square root of 9/4 to get sqrt%289%2F4%29+=+3%2F2

Note: this does NOT involve a "plus/minus" since the square root function produces exactly one output for any given input.

Now double this to get 2%2A%283%2F2%29+=+6%2F2+=+3

Therefore, the answer is d = 3