SOLUTION: how do you find a missing term that will make a trinomial a perfect square trinomial?

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Question 29752: how do you find a missing term that will make a trinomial a perfect square trinomial?
Found 2 solutions by ikdeep, Cintchr:
Answer by ikdeep(226) About Me  (Show Source):
You can put this solution on YOUR website!
For better understanding, please provide a suitable problem.

Answer by Cintchr(481) About Me  (Show Source):
You can put this solution on YOUR website!
taking an expression such as ....
+x%5E2+%2B+8x++++++=+y+
the leading coefficient (the # by the x^2) must be 1
use the formula
+%28b%2F2%29%5E2+
+%288%2F2%29%5E2+
+4%5E2+
+16+
so the last term is 16
to check ...
+x%5E2+%2B+8x++++++=+y+ plug in 16
+x%5E2+%2B+8x+%2B+16+=+y+ factor
+%28x%2B4%29%28X%2B4%29+=+y+
+%28x%2B4%29%5E2+=+y+
since 4^2=16 and 4+4=8 it is right.