( 2a - b )² + ( 4a - 2b ) ( a + b ) + ( a + b )²
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Using Identity (a +b)²= a² + 2ab + b²
=》Let (a+b) = p (say)
(2a-b) = s ( say)
=》(s )² + 2× s× p + (p)²
=》Therefore we can write :-
=》[ (2a-b) + ( a+b ) ]
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