Question

If (x+3) is a factor of f(x)=(x^4)+(K(x^3))+(11(x^2)-(7x)-12, find the value of K by two methods.

Answer 1

If (x+3) is a factor of f(x) then x = -3 is the root of f(x). in other words f(-3) = 0 then solve for K

Answer 2

Thank you! i still need one more way to solve.

Answer 3

maybe use the horner's rule