Question

1.) Find the value of a and b so that the polynomial x^ 3 - 4x^2 + ax + b is exactly divisible by x-2 as well as x+1.
plzz solve fast! !!!
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Answer 1

Answer:

Step-by-step explanation:if it should be divisible by x-2

keep x=2

so

8-16+2a+b=0

2a+b=8         - 1

now if it should be divisible by x+1

keep x=-1

so

-1-4-a+b=0

b-a=5              - 2

subtract 2 from 1

2a+b-(-a+b)=8-5

2a+b+a-b=3

3a=3                             2(1)+b=8

a=1                                  b=4