i) (2m - 3) (2m + 3) (4m² + 9)
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= (2m - 3) (2m + 3) (4m² + 9)
= ((2m)² - 3² (4m² +9)
= (4m² - 9 (4m² + 9))
= ((4m²)² - 9²
= (16m² - 81 )
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