Algebra II : Simplifying Exponents

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #81 : Simplifying Exponents

Simplify: \(\displaystyle 4^7*4^{12}\)

Possible Answers:

\(\displaystyle 4^{36}\)

\(\displaystyle 4^{19}\)

\(\displaystyle 4^{84}\)

\(\displaystyle 4^{28}\)

\(\displaystyle 4^{24}\)

Correct answer:

\(\displaystyle 4^{19}\)

Explanation:

When multiplying exponents with the same base, we just add the exponents and keep the base the same.

\(\displaystyle 4^{7}*4^{12}=4^{7+12}=4^{19}\)

Example Question #82 : Simplifying Exponents

Simplify: \(\displaystyle 5^{17}*5^{23}\)

Possible Answers:

\(\displaystyle 5^{42}\)

\(\displaystyle 5^{40}\)

\(\displaystyle 5^{391}\)

\(\displaystyle 5^{50}\)

\(\displaystyle 5^{235}\)

Correct answer:

\(\displaystyle 5^{40}\)

Explanation:

When multiplying exponents with the same base, we just add the exponents and keep the base the same.

\(\displaystyle 5^{17}*5^{23}=5^{17+23}=5^{40}\)

Example Question #83 : Simplifying Exponents

Simplify: \(\displaystyle \frac{6^{48}}{6^{12}}\)

Possible Answers:

\(\displaystyle 6^{4}\)

\(\displaystyle 6^{24}\)

\(\displaystyle 6^{22}\)

\(\displaystyle 6{^{36}}\)

\(\displaystyle 6^{30}\)

Correct answer:

\(\displaystyle 6{^{36}}\)

Explanation:

When dividing exponents with the same base, we just subtract the exponents and keep the base the same.

\(\displaystyle \frac{6^{48}}{6^{12}}=6^{48-12}=6^{36}\)

Example Question #84 : Simplifying Exponents

Simplify: \(\displaystyle \frac{8^{60}}{8^{-12}}\)

Possible Answers:

\(\displaystyle 8^{48}\)

\(\displaystyle 8^{-720}\)

\(\displaystyle 8^{64}\)

\(\displaystyle 8^{80}\)

\(\displaystyle 8^{72}\)

Correct answer:

\(\displaystyle 8^{72}\)

Explanation:

When dividing exponents with the same base, we just subtract the exponents and keep the base the same.

\(\displaystyle \frac{8^{60}}{8^{-12}}=8^{60-(-12)}=8^{72}\)

Example Question #85 : Multiplying And Dividing Exponents

Simplify the following:

\(\displaystyle (2a^2b^8c)(8bc^7)\)

 

Possible Answers:

\(\displaystyle 16a^2b^9c^8\)

\(\displaystyle 16a^2b^9c^7\)

\(\displaystyle 16b^9c^8\)

\(\displaystyle 16a^2b^8c^7\)

\(\displaystyle 16b^8c^7\)

Correct answer:

\(\displaystyle 16a^2b^9c^8\)

Explanation:

Remembering the exponent rule of multiplication:

\(\displaystyle x^m*x^n=x^{m+n}\)

Therefore:

\(\displaystyle (2a^2b^8c)(8bc^7)\)

Becomes:

\(\displaystyle 2*8a^2b^{8+1}c^{1+7}\)

Which gives the final answer:

\(\displaystyle 16a^2b^9c^8\)

Example Question #86 : Simplifying Exponents

Simplify:

\(\displaystyle \frac{12a^6b^2c^3}{4ab^7c^6}\)

Possible Answers:

\(\displaystyle \frac{3a^6b}{c^3}\)

\(\displaystyle 3a^5b^5c^3\)

\(\displaystyle \frac{a^5}{3b^5c^3}\)

\(\displaystyle \frac{4a^5}{b^5c^3}\)

\(\displaystyle \frac{3a^5}{b^5c^3}\)

Correct answer:

\(\displaystyle \frac{3a^5}{b^5c^3}\)

Explanation:

Using the exponent rules:

\(\displaystyle \frac{x^m}{x^n}=x^{m-n}\)

and:

\(\displaystyle x^{-m}=\frac{1}{x^m}\)

Gives:

\(\displaystyle (12/4)a^{6-1}b^{2-7}c^{3-6}=3a^5b^{-5}c^{-3}=\frac{3a^5}{b^5c^3}\)

Example Question #85 : Simplifying Exponents

Simplify: \(\displaystyle 15^8*15^{12}\)

Possible Answers:

\(\displaystyle 15^{96}\)

\(\displaystyle 225^{20}\)

\(\displaystyle 15^{24}\)

\(\displaystyle 225^{96}\)

\(\displaystyle 15^{20}\)

Correct answer:

\(\displaystyle 15^{20}\)

Explanation:

When multiplying exponents with the same base, we just add the exponents and keep the base the same.

\(\displaystyle 15^8*15^{12}=15^{8+12}=15^{20}\)

Example Question #86 : Simplifying Exponents

Simplify: \(\displaystyle 12^{-12}*12^{-9}\)

Possible Answers:

\(\displaystyle 12^{108}\)

\(\displaystyle 12^{-21}\)

\(\displaystyle 12^7\)

\(\displaystyle 12^{-3}\)

\(\displaystyle 12^{-14}\)

Correct answer:

\(\displaystyle 12^{-21}\)

Explanation:

When multiplying exponents with the same base, we just add the exponents and keep the base the same.

\(\displaystyle 12^{-12}*12^{-9}=12^{-12+(-9)}=12^{-21}\)

Example Question #87 : Simplifying Exponents

Simplify: \(\displaystyle 3^{-10}*3^{19}\)

Possible Answers:

\(\displaystyle 3^{-19}\)

\(\displaystyle 3^9\)

\(\displaystyle 3^{-29}\)

\(\displaystyle 3^7\)

\(\displaystyle 3^{-90}\)

Correct answer:

\(\displaystyle 3^9\)

Explanation:

When multiplying exponents with the same base, we just add the exponents and keep the base the same.

\(\displaystyle 3^{-10}*3^{19}=3^{-10+19}=3^9\)

Example Question #88 : Simplifying Exponents

Simplify: \(\displaystyle 6^{88}\div6^{44}\)

Possible Answers:

\(\displaystyle 6^{11}\)

\(\displaystyle 6^{44}\)

\(\displaystyle 6^2\)

\(\displaystyle 6^{48}\)

\(\displaystyle 6^{22}\)

Correct answer:

\(\displaystyle 6^{44}\)

Explanation:

When dividing exponents with the same base, we subtract the exponents while keeping the base the same.

\(\displaystyle 6^{88}\div6^{44}=6^{88-44}=6^{44}\)

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