Answer and explanation

Correct answer: D. 125

  1. Step 1: By definition, log_5(x) = 3 means x = 5^3.
  2. Step 2: x = 125.
Answer
125.
Why not the others: '15' multiplies base and exponent instead of raising the base to the power; '243' swaps base and exponent; '8' adds base and exponent.

Practise more Algebra, Functions, Geometry and Probability.

Free questions with an explanation for every one, and full timed Državna Matura (Bosnia & Herzegovina) mock tests.