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Mathematics
Evelyn Frey
17 January, 12:35
Factorise fully 9x^2 - 16y^2
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Jaylin Mcpherson
17 January, 13:18
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Note: a² - b² = (a-b) (a+b)
9x² - 16y² = (3x) ² - (4y) ² = (3x - 4y) (3x + 4y)
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