Practice problem
Find all real numbers xxx such that the equation ∣−x∣=−x\lvert -x\rvert = -x∣−x∣=−x holds. Choose the best answer.
The equation holds when xxx is positive.
The equation holds when xxx is negative.
The equation holds when xxx is not negative.
The equation holds when xxx is not positive.
Type a concept, like “slope” or “photosynthesis”.