Posted by Tika on Monday, April 27, 2015 at 12:44pm.
How do I make a perfect square. Sorry my addition key isn't working
y^2-18y plus______
A perfect square has the form
(y+a)²=y²+2ay+a²
If you compare with
y²-18y+a²
you can find a by equating the second term and solving for a:
2ay=-18y