Which expressions are differences of squares? Select each correct answer. t^2−1 n^2−225 k^2+81 p^2−40
Mathematics
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Question
Which expressions are differences of squares?
Select each correct answer.
t^2−1
n^2−225
k^2+81
p^2−40
Select each correct answer.
t^2−1
n^2−225
k^2+81
p^2−40
2 Answer

1. User Answers Whovian000000
t^21 and n^2225
I don't think k^2+81 because of the "+" sign, only "" signs are differences of squares. 
2. User Answers apologiabiology
a²b² is diffrence of squares
first one is
t²1², yep
2nd one
n²15², yep
3rd one is not difffernce
4th one can be forced into p²(2√10)², but I wouldn't say it is
first 2