# Further maths polynomialsWatch

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#1
When x^3+4x^2+kx+6 is divided by (x+5) the remainder is -4. What is k. I was doing polynomials today and got stuck on this question, what would I do to solve it? Would I use the factor/remainder theorem?
Thanks
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4 weeks ago
#2 hope this helps : )
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4 weeks ago
#3
(Original post by duckduck..goose) hope this helps : )
whoops! thought the remainder was equal to 4. if its -4 then it should be -5k = 15, and k = -3.
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4 weeks ago
#4
(Original post by Noah00)
When x^3+4x^2+kx+6 is divided by (x+5) the remainder is -4. What is k. I was doing polynomials today and got stuck on this question, what would I do to solve it? Would I use the factor/remainder theorem?
Thanks
You'd have been better to post in the maths forum, rather than this umbrella forum which is no where near as heavily frequented.

If we call your polynomial f(x), then you have f(-5) = -4. Just plug in the numbers and solve for k.
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3 weeks ago
#5
(Original post by duckduck..goose)
whoops! thought the remainder was equal to 4. if its -4 then it should be -5k = 15, and k = -3.
K is 3 not -3
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