Factorise: (a^2-b^2 ) (c^2-d^2 )-4 a b c d [ . Hint. Given Exp .=… - Vidyadip

Question

Factorise:
$\left(a^2-b^2\right)\left(c^2-d^2\right)-4 a b c d \quad\left[\right.$ Hint. Given Exp $\left.=(a c-b d)^2-(a d+b c)^2\right]$

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Answer

(ac - bd + ad + bc) (ac - bd - ad - bc)

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