Question

if x+1 and x-1 are the factors of thr polynomial f(x)=x^3+ax^2+bx+5 find the value of a and b​

Answer 1

Step-by-step explanation:

It will help you !!

Answer 2

Answer:

f(-1)=0 and f(1)=0

f(-1)=0 gives a-b+4=0 equ 1

f(1)=0 gives a+b+6=0 equ 2

adding equ 1 and equ 2 we get

2a+10=0

a= -5

putting value of a in equ 1 we get

b= -1