Exponent rules with examples step by step

Understanding exponent rules is essential for simplifying expressions and solving equations in algebra. These rules help manage calculations involving powers of numbers.

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What is the product rule?

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When multiplying two powers with the same base, add the exponents: am⋅an=am+n\displaystyle a^m \cdot a^n = a^{m+n}.

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1. What is the result of 54⋅52\displaystyle 5^4 \cdot 5^2?

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What is the product rule?

When multiplying two powers with the same base, add the exponents: am⋅an=am+n\displaystyle a^m \cdot a^n = a^{m+n}.

What is the quotient rule?

When dividing two powers with the same base, subtract the exponents: aman=am−n\displaystyle \frac{a^m}{a^n} = a^{m-n}.

What is the power of a power rule?

When raising a power to another power, multiply the exponents: (am)n=am⋅n\displaystyle (a^m)^n = a^{m \cdot n}.

Fill in the blank: a0\displaystyle a^0 is equal to ____.

a0=1\displaystyle a^0 = 1, as long as a≠0\displaystyle a \neq 0.

True or false: a−n=1an\displaystyle a^{-n} = \frac{1}{a^n}

True, because negative exponents represent the reciprocal of the base raised to the positive exponent.

Difference between a−m\displaystyle a^{-m} and am\displaystyle a^m?

a−m=1am\displaystyle a^{-m} = \frac{1}{a^m}; am\displaystyle a^m is the positive power.

What happens when the base is multiplied?

For the same base, use the product rule: abm⋅abn=am+n\displaystyle ab^m \cdot ab^n = a^{m+n}.

What is the exponent of 1?

Any number raised to the power of 1 is itself: a1=a\displaystyle a^1 = a.

Example of the power of a product rule?

For (ab)n\displaystyle (ab)^n, use: (ab)n=an⋅bn\displaystyle (ab)^n = a^n \cdot b^n.

What is the exponent of 0?

For any non-zero base, a0=1\displaystyle a^0 = 1. This means anything raised to zero equals one.

Question: What is 23⋅22\displaystyle 2^3 \cdot 2^2?

Use the product rule: 23⋅22=23+2=25=32\displaystyle 2^3 \cdot 2^2 = 2^{3+2} = 2^5 = 32.

Which rule applies to x5x2\displaystyle \frac{x^5}{x^2}?

Use the quotient rule: x5x2=x5−2=x3\displaystyle \frac{x^5}{x^2} = x^{5-2} = x^3.

What is the significance of negative exponents?

Negative exponents indicate reciprocals: a−n=1an\displaystyle a^{-n} = \frac{1}{a^n}.

True or false: (32)3=36\displaystyle (3^2)^3 = 3^6.

True, because of the power of a power rule: (am)n=am⋅n\displaystyle (a^m)^n = a^{m \cdot n}.

If x3=8\displaystyle x^3 = 8, find x\displaystyle x.

Cube root both sides: x=2\displaystyle x = 2 since 23=8\displaystyle 2^3 = 8.

Fill in the blank: $a^4 \div a^2 = ____.

a4÷a2=a4−2=a2\displaystyle a^4 \div a^2 = a^{4-2} = a^2.

Frågor i det här studiesetet(15)

1. What is the result of 54⋅52\displaystyle 5^4 \cdot 5^2?

A.56\displaystyle 5^6
B.58\displaystyle 5^8
C.510\displaystyle 5^{10}
D.512\displaystyle 5^{12}

2. What is the value of a0\displaystyle a^0?

A.0
B.1
C.a
D.Undefined

3. Which expression equals b3b5\displaystyle \frac{b^3}{b^5}?

A.b−2\displaystyle b^{-2}
B.b1\displaystyle b^1
C.b0\displaystyle b^0
D.b2\displaystyle b^2

4. Which is NOT a property of exponents?

A.am⋅an=am+n\displaystyle a^m \cdot a^n = a^{m+n}
B.a−n=1an\displaystyle a^{-n} = \frac{1}{a^n}
C.am÷an=am+n\displaystyle a^m \div a^n = a^{m+n}
D.(am)n=am⋅n\displaystyle (a^m)^n = a^{m \cdot n}

5. Evaluate (23)2\displaystyle \left(2^3\right)^2.

A.25\displaystyle 2^5
B.26\displaystyle 2^6
C.27\displaystyle 2^7
D.28\displaystyle 2^8

6. If x3=27\displaystyle x^3 = 27, what is x?

A.1
B.2
C.3
D.4

7. What does 5−2\displaystyle 5^{-2} equal?

A.0.2
B.125\displaystyle \frac{1}{25}
C.25
D.5

8. Using exponents, how can you express 2⋅2⋅2\displaystyle 2 \cdot 2 \cdot 2?

A.22\displaystyle 2^2
B.23\displaystyle 2^3
C.24\displaystyle 2^4
D.25\displaystyle 2^5

9. Which expression is equivalent to m6m2\displaystyle \frac{m^6}{m^2}?

A.m4\displaystyle m^{4}
B.m8\displaystyle m^{8}
C.m3\displaystyle m^{3}
D.m0\displaystyle m^0

10. Simplify (32⋅33)⋅31\displaystyle (3^2 \cdot 3^3) \cdot 3^1. What is the exponent?

A.1
B.3
C.5
D.6

11. If y−3=1y3\displaystyle y^{-3} = \frac{1}{y^3}, what is y3\displaystyle y^{3}?

A.y3\displaystyle y^3
B.1y3\displaystyle \frac{1}{y^3}
C.y−3\displaystyle y^{-3}
D.Undefined

12. What is (42)3\displaystyle (4^2)^3 equal to?

A.45\displaystyle 4^5
B.46\displaystyle 4^6
C.47\displaystyle 4^7
D.48\displaystyle 4^8

13. Which of these expressions is equivalent to a3⋅a−3\displaystyle a^3 \cdot a^{-3}?

A.1\displaystyle 1
B.0\displaystyle 0
C.a6\displaystyle a^6
D.a\displaystyle a

14. If 2x=16\displaystyle 2^x = 16, what is x?

A.2
B.3
C.4
D.5

15. Which is NOT true for am⋅an\displaystyle a^m \cdot a^n?

A.am+n\displaystyle a^{m+n}
B.am−n\displaystyle a^{m-n}
C.am\displaystyle a^m
D.an\displaystyle a^n

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