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Given x ^ 2 + 5x-990 = 0, try to find the value of x ^ 3 + 6x ^ 2-985x + 1015
x^2+5x-990=0
x^2+5x=990
x^3+6x^2-985x+1015
=x^3+5x^2+x^2-985x+1015
=x(x^2+5x)+x^2-985x+1015
=990x+x^2-985x+1015
=x^2+5x+1015
=990+1015
=2005
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