As your question is stated, there is no answer!
I'm going to assume the polynomial you meant is:

To create a perfect square trinomial, take half the coefficient of x and then square it.

In all problems like this, you want to square half the coefficient of x -- always half.
Um, I think it's:
(x) + (x+6) = 42
16/25 is the highest, because if you multiply it by four you get 64/100, and the rest of the fractions are negative.
Answer:
If
is people and
is hot dogs, the equation is
.