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Factorising

What's 58squared minus 42squared
1600?
Reply 2
58242258^2 - 42^2 is the difference between two squares. So how would you factorise a2b2a^2 - b^2? And then, how would you factorise 58242258^2 - 42^2 to make your life a bit easier?

Also, moved to the maths forum.
(edited 5 years ago)

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