Question 201392
simplify the left side of the equation to get

-2k^3 <= 4k

divide both sides by k to get

-2k^2 <= 4

divide both sides of the equation by -2 to get

k^2 >= -2

take the square root of both sides of the equation to get

k >= square root of (-2)

to prove your answer is correct you need to.

1.  let k = square root (-2) and solve.  the equation should hold true.

2.  let k be > than square root (-2) and solve.  the equation should hold true.

3.  let k be < than square root (-2) and solve.  the equation should be false.