ACT Preparation / Unit 12 ACT 1101 short lesson, about 20 seconds
Exponential Functions
Captions available
The idea
An exponential function has the form f(x) = a·bˣ, with b > 0 and b ≠ 1. The constant a is the initial value, the output when x = 0.
In practice
f(x) = 500(1.04)ˣ starts at 500 and is multiplied by 1.04 for each step in x.
Where people slip
The variable sits in the exponent; x² is a different family.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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