Posted by Erica on .
Find the value of c that makes the expression a perfect square trinomial. Then write the expression as the square of a binomial. I didn't really understand what that meant.
x^223x+c
x^2(2/7)x+c

Algebra 2 
Reiny,
take half the middle term coefficient, square it
x^2  23x + 526/4
= (x 23/2)^2
looks like you learning the process of "completing the square"
here is an easier one ...
x^2 + 10x + c
or
x^2 + 10x + 25 ,,,,,(half of 10 is 5, 5^2 = 25)
= (x+5)^2
expand (x+5)^2 to see why this happens
Now try your own second question and let me know what you got for c .