Further maths polynomialsWatch
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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?
In answer to your question, yes, the remainder theorem.
If we call your polynomial f(x), then you have f(-5) = -4. Just plug in the numbers and solve for k.