2x³+4x²-30x = 2x(x²+2x-15) = 2x(x²-3x+5x-15) = 2x²(x(x-3)+5(x-3)) = 2x²(x+5)(x-3)
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2x³+4x²-30x = 2x(x²+2x-15) = 2x(x²-3x+5x-15) = 2x²(x(x-3)+5(x-3)) = 2x²(x+5)(x-3)