factorise 4 x square + 9 Y squared minus 25 z square + 12 x y
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4x² + 9y² - 25z² + 12 xy
= (2x) ² + (3y)² - (5z)² + 2*2x*3y
= (2x + 3y) ² - (5z) ²
= ( 2x + 3y - 5z) (2x + 3y + 5z)
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