Understanding Exponents
An exponent (also called a power or index) represents repeated multiplication. In the expression an, 'a' is the base and 'n' is the exponent, meaning 'a' is multiplied by itself 'n' times.
Key Exponent Rules
- Product Rule: am ร an = am+n
- Quotient Rule: am รท an = am-n
- Power Rule: (am)n = amรn
- Zero Exponent: a0 = 1 (where a โ 0)
- Negative Exponent: a-n = 1 / an
- Fractional Exponent: am/n = nโ(am)
Common Applications
- Compound Interest: A = P(1 + r)t
- Population Growth: P(t) = Pโert
- Radioactive Decay: N(t) = Nโe-ฮปt
- Computer Science: Binary operations (2n)
- Physics: Inverse square law (1/r2)