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which value of k does equation x^4 – 4x^2 + x + k = 0 have 4 real roots

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which value of k does equation x^4 – 4x^2 + x +...

Choices for value of k are -2, 1,3. Need to understand how to do this. Thank you.

solving equations

asked Jul 10, 2014 in Pre-Algebra Answers by Dazed&confused

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1 Answer

Given x^4 – 4x^2 + x + k = 0

Have x=4 real roots

Put x=4 in the equation
4^4 – 4*4^2 + 4+ k = 0
k=-196

Pre Algebra Help - http://www.mathcaptain.com/algebra/pre-algebra.html

answered Jul 10, 2014 by John Marsh Level 8 User (30.1k points)

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