Question

Factorise (l+m)²-4lm​

Answer 1

Answer:

${(l + m)}^{2} - 4lm \\ {l}^{2} + 2lm + {m}^{2} - 4lm \\ {l}^{2} + {m}^{2} - 2lm \\ \underline{\boxed{{( l - m)}^{2} }}$