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Another Quintic Problem (Posted on 2006-05-31) Difficulty: 4 of 5
The equation x5 23x3 66x2 +px +q =0 has three non-zero roots, and two of them are integers, with multiplicity 2.

Find p and q and determine all the roots of the given equation.

See The Solution Submitted by K Sengupta    
Rating: 3.6667 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Who needs p and q? (SPOILER) | Comment 2 of 5 |
(In reply to Who needs p and q? (SPOILER) by Old Original Oskar!)

It seems that there is a minor typographical error in terms of the solution to the above problem.

 

In terms of the remainder theorem,  the polynomial P(x) = x^5-23x^3-66x^2-68x+24, possesses the respective values -256 and -132 corresponding to x=2 and x=1, not giving any zeroes for the aforementioned x values.<o:p></o:p>

 

Incidentally, ((x-2)^2)*((x-1)^2)*(x+6)= x^5 - 23x^3 +66*x^2- 68x + 24, so the coefficient of x^2 in P(x) should be +66 instead of -66.

Edited on May 31, 2006, 2:42 pm
  Posted by K Sengupta on 2006-05-31 14:40:45

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