Question 1004249
1. y=x²-16x+____

Add and subtract the term,  {{{(16/2)^2=8^2}}}.
{{{y=(x-8)^2-64}}}



2. y=x²+3x+____

Add and subtract the term, (3/2)^2.
{{{y=(x+3/2)^2-9/4}}}



<a href="http://www.algebra.com/my/Completing-the-Square-to-Solve-General-Quadratic-Equation.lesson?content_action=show_dev">LESSON: How to solve quadratic equation using Completing the Square</a>