Tara F.

# Finding the value of a constant

Determine the value of the constant k so that x-2 is a factor of the function g(x)=2x^4+kx^3+3x+4

## 3 Answers By Expert Tutors

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Tejas S. answered • 06/01/15

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4 (2)

Math, Physics & Chemistry Tutor - Alexandria, VA

David W.

tutor
And, checking:     Does  g(2) = 2*(2^4)+(-5.25)*(2^3)+3*(2)+4   =  0    ?    Yes.
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06/01/15

David W. answered • 06/02/15

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4.5 (50)

Experienced Prof

Michael J.

You should give the tutors a chance to catch their errors, rather than thinking they will just let it slide.  In addition, you are right that we cannot change comments, but we can add a new comment that corrects the previous comment.
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06/03/15

David W.

tutor
My experience is (not verified with WyzAnt) that there is a small quota for comments that I may add per time period (or other).
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06/03/15

Michael J. answered • 06/01/15

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5 (5)

Effective High School STEM Tutor & CUNY Math Peer Leader

David W.

tutor
And, checking:       Does   g(2) =2*2^4+(-0.25)*2^3+3*(2)+4 = 0  ?  No, it equals 40, so k ≠ -1/4.
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06/01/15

Michael J.

I checked my work.  You will see that my solution will match Tejas'.  We only had a different method of solving the problem.
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06/01/15

Andrew M.

Michael's answer is k = - 21/4 which is -5.25 which does work out as already shown above by Tejas S.
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06/02/15

David W.

tutor
Michael's answer now says k = -21/4, which is quite correct.   THX.   As you can see, I quoted his answer as  "k=-1/4" and indicated "k ≠ -1/4."
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06/02/15

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