Is n^2+50n+25 a perfect square

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?

The number 72 lies between what perfect squares