Question

Q3 Factorise: Lm2- mn2- lm+ n2​

Answer 1

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Answer 2

$= {lm}^{2} - {mn}^{2} - lm + {n}^{2}$

$= m(lm - {n}^{2} ) - 1(lm - {n}^{2} )$

$= (m - 1)(lm - {n}^{2} )$