how do I find the real roots of polynominal equations

x to the 3rd + 6x to the 2nd - 5x -30 = 0....help!
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x^3+6x^2-5x-30=0; x^3+6x^2-5(x+6)=0; x^2(x+6)-5(x+6)=0; (x^2-5)(x+6)=0, so x=-6, sqrt(5), -sqrt(5) are the roots.
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