Answer :
In the given expression l2 – (m – n)2
Both terms are perfect square
⇒ l2 = l × l
⇒ (m – n)2 = (m – n) × (m – n)
∴ l2 – (m - n)2 Seems to be in identity a2-b2 = (a + b)(a-b)
Where a = a and b = (m - n);
∴ l2 – (m – n)2 = (l + m-n)(l-m + n)
Hence the factors of l2–(m–n)2are (l + m-n)(l-m + n)
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