Question

please help me its emergency

Answer 1

x-1=0
x=1
put x in
ax^3-x^2-2x+b
a(1)-1-2+b
a-3+b=0
a+b=0----------(1)
x+1=
x=-1
a(-1)-1+2+b
-a+1+b=0
a-b=1------------(2)
from 1 and 2
a=2
b=1



hope it is correct


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Answer 2

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a = 2

b = 1