Question

Use synthetic division to prove that the number k is an upper bound for the real zeros of the function f.
k=4
f(x)=4x^4-16x^3+8x^2+16x-12

Answer 1

carry out the synthetic division, the last row of numbers should all be positive if the value k=4 is an upperbound

Answer 2

to clear up process, i would divide by x+4?