Question

Find the number that should be added to the expression to make it a perfect square.
k^2-5k
(simplify your answer. Type an integer or a faction)

Would it be k^2-5k+6.25

Answer 1

i think that there is some method where you divide the coefficient of the k term by two and then square it and then add that value to the end of the equation.

just remembered, its called completing the square
http://www.purplemath.com/modules/sqrquad.htm
http://www.youtube.com/watch?v=xGOQYTo9AKY