# Finding Maximum Root [duplicate]

How can I find the greatest root for a polynomial if the polynomial degree is very large. One way is using NSolve. This command can find all roots in numeric. Then, to find maximum root one can be use the command Max. This takes very long time for my calculation. Is there any short way to find max. root?

P.S: i am looking for the roots only real Thanks...

• "Greatest" as in "greatest in magnitude"? Are the roots of your polynomial all real, or can there be complex roots? – J. M. will be back soon Apr 10 '13 at 15:49
• i am looking for the roots only real – MATIRMAK Apr 10 '13 at 15:59