You’re missing parens around the expansion of the second odd square… or missing minus signs.
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Alt: If n, m are odd n*n - m*m = (n-m)(n+m). Difference or sum of two odd numbers is even. So product is divisible by 4.
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simpler yet: square of even number always divisible by 4. Diff of 2 odds always even. Done.
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Use parenthesis please
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Use “parentheses” please
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just a comment, either signs are "-" instead of "+" in "4b" & second "1", or you need parentheses, right?
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defenetion or definition?
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Results are good but signs are wrong in the intermediate step....
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A typo perhaps? -4b^2 - 4b - 1? Otherwise your third equality doesn't follow
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Second to last line is wrong.
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