What cube root equals 21? In other words, what number would you take the cube root of to get 21? To solve this problem, we want to find x in the following equation:
∛x = 21
To solve the ∛x = 21 equation, we first raise both sides to the power of 3 to eliminate the cube root:
(∛x)³ = 21³
x = 21³
Then, we calculate 21³ to get the following answer:
21³ = 21 × 21 × 21
21³ = 9,261
∛9,261 = 21
We made the equation above so you will get a full understanding of how to solve problems like this. In the future, note that you can solve all similar problems by simply multiplying the number by itself twice to get the answer.
What Cube Root Equals
Use the tool below to solve another problem like the one we solved on this page.
What cube root equals 22?
Here is another cube root problem that you may find interesting.