2x^3-3^2-17x+30 how do we factorise
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2x^3-3x^2-17x+30
=2x^3-4x^2+x^2-2x-15x+30
=2x^2(x-2)+x(x-2)-15(x-2)
=(x-2)(2x^2+x-15)
=(x-2)(2x^2+6x-5x-15)
=(x-2)(2x-5)(x+3)
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