Question

please say me proper answer given that photo
please solve in paper ​

Answer 1

The formula used in no. 1,2,5 is (a+b)² = a²+2ab+b² and (a-b)²=a²+2ab+b²

The formula used in no. 3,4 is (a²-b²) = [ (a)²+(b)²] = (a+b)(a-b)

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