I need help finding real zeros of polynomial R(x)=8x^3-15x^2-18x-2

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I need help finding real zeros of polynomial R(x)=8x^3-15x^2-18x-2

[From: ] [author: ] [Date: 11-07-09] [Hit: ]

If I can get help in seeing how to approach this I would greatly appreciate it.

Also for 4x^3-14x^2+25. Thankyou for your time

x = -(1/8) || x = 1 - Sqrt[3] || x = 1 + Sqrt[3]

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