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Given x ^ 2 + 5x-990 = 0, try to find the value of x ^ 3 + 6x ^ 2-985x + 2011 In a hurry
x^3+6x^2-985x+2011
=x^3+5x²-990x +x²+5x-990+3001
=x(x²+5x-990)+(x²+5x-990)+3001
=3001
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