4x²+12xy+9y² factorise the algebraic expressions
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using identity
=( a + b ) whole square = a square + b square + = 2ab
= 2x square + 2 ( 2x )( 3y) + 3y square
= ( 2x + 3y ) whole square
=( a + b ) whole square = a square + b square + = 2ab
= 2x square + 2 ( 2x )( 3y) + 3y square
= ( 2x + 3y ) whole square
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