Question

Factorise : 4( 2a + b )² - ( a - b )²​

Answer 1

Answer:

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Answer 2

4 ( 2a + b ) ² - ( a - b ) ²

4 ( 4a² + 4ab + b² ) - ( a - b ) ²

16a² + 16ab + 4b² - ( a - b ) ²

16a² + 16ab + 4b² - ( a² - 2ab + b² )

16a² + 16ab + 4b² - a² - 2ab + b²

15a² + 16ab + 4b² + 2ab - b²

15a² + 18ab + 4b² - b²

15a² + 18ab + 3b²