Answer:
k= -14
Step-by-step explanation:
since f(x) is divided by x-5
x-5=0
therefore, x=5
x³-4x+k=91
since x=5
5³ - 4(5) + k= 91
125 - 20 + k = 91
105 + k= 91
k = 91 - 105
k = -14
