Seudónimo Seudónimo

01-02-2017
Mathematics

contestada

Which expressions are differences of squares?

Select each correct answer.

t^2−1

n^2−225

k^2+81

p^2−40

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Whovian000000 Whovian000000

01-02-2017

t^2-1 and n^2-225

I don't think k^2+81 because of the "+" sign, only "-" signs are differences of squares.

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apologiabiology apologiabiology

01-02-2017

a²-b² is diffrence of squares

first one is
t²-1², yep

2nd one
n²-15², 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

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