SOLUTION: Could someone help me please. This is a trinomial not a polynomial. Find the constant term that should be added to make the following expression a perfect square trinomial. x^2+1

Question 88164: Could someone help me please. This is a trinomial not a polynomial.
Find the constant term that should be added to make the following expression a perfect square trinomial.
x^2+18x
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
This is called "completing the square". Assuming that the coefficient of the x^2 term is 1, you take HALF of the x coefficient, and SQUARE it. In this case, take HALF of 18 (which is 9) and SQUARE (which is 81).

Now you have

The final answer is 81.

R^2
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