Question 440153
In order to "complete the square on x^2-20x, you have to take HALF of the coefficient of -20x which would be -10.  The only answer that has (x-10)^2 is C.  Moreover, if you expand (x-10)^2 -100, you get x^2-20x, which is correct!!


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida