Question

Factorise :- 20 (ab +cd) – a2 – b2 +c 2 +d2​

Answer 1

Answer:

2(ab+cd)−a2−b2+c2+d2

=(c2+2cd+d2)−(a2−2ab+b2)

=(c+d)2−(a−b)2

=(c+d+a−b)(c+d−a+b)

Answer 2

Answer:

i hope this helps

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