Question

(x+1)and (x+2) are the factor of polynomial x cube + 3 x square - 3 b X + a then find b and a

Answer 1

Answer:

Step-by-step explanation:

From factors, we get x=(-1) and x=(-2)

Putting x=(-1)

(-1)^3+3(-1)^2-3b(-1)+a

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

Putting x=(-2)

(-2)^3+3(-2)^2-3b(-2)+a

=6b+a+4.....(2)

Eq.(1)-(2)

3b+a+2-(6b+a+4)

(-3b)-2=0

b=(-2/3)

Putting value of b in (1)

3(2/3)+a+2=0

2+a+2=o

a=(-4)