CPM Homework Help : CCA2 Problem 2-51

Represent the number you would have to add to an expression of the form $x^2+bx$ to make a complete square.

Hint:

Complete the generic rectangle below to determine what you would need to add to the given expression to make a complete square.

2 by 2 square, top edge labeled, x, on left, b halves, on right. Left edge labeled, x, on top, b halves, on bottom.