Question

What are the possible values for x in the equation
x
3
=
216
? Choose the two correct answers.

A.
6

B.
3
√
216

C.
3
3
√
24

D.
6
3
√
6

Answer 1

x^3 = 216 ⇒ x = ∛216 = 6. Options giving 6 are A (6) and B (∛216). So A and B.

(If complex roots were allowed, the other two are −3 ± 3√3 i, but those are not among the choices.)