Question

If x > 0, which of the following is positive?

1. -x
2. x^2
3. (-x)^3
4. 1/-x

Answer 1

`x^2`

Explanation:

`x > 0~\text{means that x is positive number.}`

`\text{Square of both negative and positive numbers are always positive.}\\\\\text{So,}~ x^2~\textbf{is positive.}`