Question

If x +2 is a factor of x³ - 2ax² + ax - 1 then the value of a is: (a) 10/9 (b) -9/10 (c) –10/9 (d) 9/10

Answer 1

Answer:

(b) -9/10

Step-by-step explanation:

x+2=0

x = -2

x³ - 2ax² + ax -1 = 0

(-2)³ - 2a(-2)² + a(-2) - 1 =0

-8 - 8a -2a -1=0

-10a -9=0

a= -9/10

Answer 2

Answer:

Option (b) -9/10

I hope it will help you