Exam-style question
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Which function is an exponential function?.
- A.y = 2x
- B.y = 2x²
- C.y = 2ˣ
- D.y = log₁₀ x
Model answer
What a good answer should say
- y = 2ˣ
Explanation
Why this works
In an exponential function, the variable is used as an exponent. In y = 2ˣ, x is the exponent.
Common mistake
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