Which of the following is equal to its own cube?

The correct answer is: - 1

TO FIND-
Number from the given options for which its cube = the same number
i.e. x³ = x
SOLUTION-
We will substitute all the numbers in the given options and check for the given condition.
a. -3
(-3)³ = (-3) * (-3) * (-3) = -27
b. -9
(-9)³ = (-9) * (-9) * (-9) = -729
c. -1
(-1)³ = (-1) * (-1) * (-1) = -1
Hence, for the number -1, its cube = the number itself.
d. -2
(-2)³ = (-2) * (-2) * (-2) = -8
FINAL ANSWER-
Option 'c' i.e. '-1' is the correct answer to the given question.