Simplify the Product: 2¹ × 2² × 2³ Using Exponent Rules

Exponent Rules with Same Base Multiplication

Simplify the following equation:

21×22×23= 2^1\times2^2\times2^3=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:03 According to the laws of exponents, the multiplication of powers with an equal base (A)
00:08 equals the same base raised to the sum of the exponents (N+M)
00:12 We will apply this formula to our exercise
00:17 We'll maintain the base and add together the exponents
00:29 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Simplify the following equation:

21×22×23= 2^1\times2^2\times2^3=

2

Step-by-step solution

To simplify the expression 21×22×232^1 \times 2^2 \times 2^3, we'll apply the rule for multiplying powers with the same base:

  • When multiplying powers with the same base, you add the exponents.

Let's apply this to our expression:

21×22×23=21+2+32^1 \times 2^2 \times 2^3 = 2^{1+2+3}

Now, calculate the sum of the exponents: 1+2+3=61 + 2 + 3 = 6.

Thus, the expression simplifies to

262^6.

By comparing it with the given choices, the correct simplified form, 21+2+32^{1+2+3}, corresponds to choice 2:
21+2+32^{1+2+3}.

3

Final Answer

21+2+3 2^{1+2+3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: When multiplying same bases, add the exponents together
  • Technique: 21×22×23=21+2+3 2^1 \times 2^2 \times 2^3 = 2^{1+2+3} before calculating
  • Check: Verify 26=64 2^6 = 64 equals 2×4×8=64 2 \times 4 \times 8 = 64

Common Mistakes

Avoid these frequent errors
  • Multiplying the exponents instead of adding them
    Don't calculate 21×2×3=26 2^{1 \times 2 \times 3} = 2^6 by multiplying exponents = wrong method! This confuses the power rule with the product rule. Always add exponents when multiplying same bases: 21+2+3 2^{1+2+3} .

Practice Quiz

Test your knowledge with interactive questions

\( 112^0=\text{?} \)

FAQ

Everything you need to know about this question

Why do I add the exponents instead of multiplying them?

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When you multiply powers with the same base, you're essentially combining repeated multiplication. 21×22×23 2^1 \times 2^2 \times 2^3 means 2 × (2×2) × (2×2×2), which gives you six 2's total: 26 2^6 !

What if the bases are different, like 23×32 2^3 \times 3^2 ?

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You cannot combine exponents when bases are different! 23×32 2^3 \times 3^2 must be calculated as 8 × 9 = 72. The addition rule only works with identical bases.

How do I remember this rule?

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Think of exponents as counting how many times the base appears. When multiplying, you're adding more copies of the base, so you add the counts (exponents)!

Should I calculate 1+2+3 1+2+3 right away?

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The question asks for the simplified form, which is 21+2+3 2^{1+2+3} . You can calculate 1+2+3=6 1+2+3=6 to get 26 2^6 , but both forms show you applied the rule correctly!

What's the difference between 26 2^6 and 21+2+3 2^{1+2+3} ?

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They're mathematically identical! 21+2+3 2^{1+2+3} shows your work clearly, while 26 2^6 is the final simplified form. Both demonstrate understanding of exponent rules.

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