9x²-3x²-9 factorise by s splitting middle term
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9x^2-3x-9
9x^2-3x-99x^2-27x+3x-9
9x^2-3x-99x^2-27x+3x-99x(x-3)+3(x-3)
9x^2-3x-99x^2-27x+3x-99x(x-3)+3(x-3)(9x+3)(x-3)
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