If 2a = (32)1/3, then a is equal to:
2023
If 2a = (32)1/3, then a is equal to:
- A.
1/3
- B.
4/5
- C.
4/8
- D.
5/3
Show answer & explanation
Correct answer: D
When two powers with the same base are equal, their exponents must be equal — so to solve for an unknown exponent, first rewrite both sides as powers of one common base.
Express 32 as a power of 2: 32 = 25.
Substitute into the equation: 2a = (25)1/3.
Apply the power-of-a-power rule (multiply the exponents): (25)1/3 = 25/3.
Both sides now share the base 2: 2a = 25/3.
Since the bases match, equate the exponents directly: a = 5/3.
Check: cubing 25/3 gives 25 = 32, which matches (32)1/3 cubed back to 32 — confirming the value is consistent.
So a = 5/3.