Expression

[Cute]

If x=k, is the expression x^3+ax^2+bx equal to zero

1. a=0

2. -b=k^2

[score800]

C it is

[Cute]

score800, can you explain your answer.

[Ashoka]

'C' for me.

Using statment 2: k^3 +a*k^2 -k^2*k.

Now, using stat. 1 (a=0) the expr. is k^3 +0*k^2 -k^2*k = k^3 - k^3 = 0