x^3+5x^2-18 Using the method of adding and removing items

x^3+5x^2-18
=x^3+3x²+2x²-18
=x²(x+3)+2(x²-9)
=x²（x+3）+2（x-3）（x+3）
=[x²+2（x-3）]（x+3）
=（x²+2x-6）（x+3）

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