Question

(a ^ 2 + b ^ 2) - (c ^ 2 + d ^ 2) - 2(ab + cd)
Please factorise it​

Answer 1

Answer:

2(ab+cd)−a

2

−b

2

+c

2

+d

2

=(c

2

+2cd+d

2

)−(a

2

−2ab+b

2

)

=(c+d)

2

−(a−b)

2

=(c+d+a−b)(c+d−a+b)

Step-by-step explanation:

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