Question

If (x+3) is one of the factors of x³+2x²-ax-18. Then a =?

Answer 1

Answer:

a=9

Step-by-step explanation:

since (x+3) is a factor,

x = -3

(-3)³+2(-3)²-a(-3)-18=0

-27+2(9)+3a=18

-27+18+3a=18

-9+3a=18

3a=18+9

3a=27

a=9