Exponent Rules 20F805
1. The problem: Understand and explain the rules of exponents.
2. The main exponent rules are:
- Product rule: $$a^m \times a^n = a^{m+n}$$
- Quotient rule: $$\frac{a^m}{a^n} = a^{m-n}$$
- Power rule: $$(a^m)^n = a^{m \times n}$$
- Zero exponent rule: $$a^0 = 1$$ (for $a \neq 0$)
- Negative exponent rule: $$a^{-n} = \frac{1}{a^n}$$
- Power of a product: $$(ab)^n = a^n b^n$$
3. Explanation:
- When multiplying powers with the same base, add the exponents.
- When dividing powers with the same base, subtract the exponents.
- When raising a power to another power, multiply the exponents.
- Any nonzero number raised to the zero power equals 1.
- A negative exponent means take the reciprocal of the base raised to the positive exponent.
- When raising a product to a power, raise each factor to that power.
4. Examples:
- $$2^3 \times 2^4 = 2^{3+4} = 2^7 = 128$$
- $$\frac{5^6}{5^2} = 5^{6-2} = 5^4 = 625$$
- $$(3^2)^3 = 3^{2 \times 3} = 3^6 = 729$$
- $$7^0 = 1$$
- $$4^{-2} = \frac{1}{4^2} = \frac{1}{16}$$
- $$(2 \times 3)^4 = 2^4 \times 3^4 = 16 \times 81 = 1296$$
These rules help simplify expressions involving exponents efficiently and correctly.