3x^2 - 4x +15 by splitting the middle term method.
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I am assuming its 3x²-4x-15 since 3x²-4x+15 cannot factorise
3x² - 4x - 15
3x² + 5x - 9x - 15
x(3x + 5) - 3(3x + 5)
(3x + 5)(x - 3)
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