. Factorise: 25x² -4y² -9z² +12yz
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25x² - 4y² - 9z² + 12yz
25x² - ( 4y² + 9z² - 12yz )
( 5x ) ² - ( 2y - 3z ) ²
( 5x - 2y + 3z ) ( 5x + 2y - 3z )
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