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Advanced MathEasy–MediumRecognising an exponential function

Advanced Math practice question

Which of the following functions is exponential?

  1. A. f(x) = 3·2ˣCorrect
  2. B. f(x) = 2x³
  3. C. f(x) = 3x + 2
  4. D. f(x) = x²

Answer: A. f(x) = 3·2ˣ

An exponential function has the variable in the exponent.

Why the other answers are wrong

B. f(x) = 2x³
A cubic: the variable is the base.
C. f(x) = 3x + 2
Linear.
D. f(x) = x²
Quadratic.

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