Question

evaluate :m(m-1)-n(n-1)

Answer 1

m^2 -m-n^2 - n is the ans.
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Answer 2

${m}^{2} - m - {n}^{2} + n$
${m}^{2} - {n}^{2} - (m - n)$
$(m - n)(m + n) - (m - n)$
$(m - n)(m + n - 1)$