Module 7 · Exponents · Lesson 31 of 39
The power rule
A power raised to a power: multiply the exponents.
In this lesson · about 8 minutes
- Use the power rule
- Combine it with the other rules
Power rule: (xa)b = xa·b. (22)4 = 22·4 = 28 = 256, because it's 22 written as a factor 4 times, and 2 + 2 + 2 + 2 = 8.
(32)2 = 34 = 81.
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