Question

determinants question ...solve it ​

Answer 1

Cross - multiplying both the terms and subtracting them.

$(ad+bc)(ad+bc)-(ac-bd)(bd-ac)\\=(ad+bc)^2-(abcd-a^2c^2-b^2d^2+abcd)\\=a^2d^2+b^2c^2+2abcd-(2abcd-a^2c^2-b^2d^2)\\=a^2d^2+b^2c^2+a^2c^2+b^2d^2$

Answer 2

Step-by-step explanation:

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