Given that x is a number greater than 0, molly conjectured that x3> 3x+3 . which value is a counterexample to molly's conjecture?

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?