Factorise 9x²-4(y+2x)²
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Step-by-step explanation:
9x² - 4( y + 2x )²
= ( 3x )² - { 2( y + 2x ) } ²
= { 3x + 2y + 4x } { 3x + 2y - 4x }
= { 7x + 2y } { - x + 2y }
OR
= - { 7x + 2y } { x + y } .
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