X^3=21

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To solve for x in the equation x^3 = 21, you can take the cube root of both sides:

x = ∛21

To simplify the cube root of 21, you can factor it into prime factors:

21 = 3 * 7

So, x = ∛(3 7)
x = ∛3 ∛7
x = ∛(3) ∛(7)
x = 3^(1/3) 7^(1/3)

Therefore, the solution to the equation x^3 = 21 is x = 3^(1/3) * 7^(1/3) or approximately x = 2.758.