Expand the Expression: 4^(a+b+c) Using Power Properties

Exponent Laws with Sum-to-Product Expansion

Expand the following equation:

4a+b+c= 4^{a+b+c}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:07 Let's find out which expressions match the original one.
00:11 According to power laws, when you multiply powers with the same base, A,
00:16 you keep the base, and add the exponents, so it's A to the power of N plus M.
00:22 Let's use this formula in our exercise.
00:25 Here, we see addition, not multiplication, so this expression doesn't match.
00:31 This expression has multiplication, not addition, so it's not relevant either.
00:36 We'll keep the base, and add the exponents together for the correct solution.
00:43 And that's how we solve it!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Expand the following equation:

4a+b+c= 4^{a+b+c}=

2

Step-by-step solution

To solve this problem, we will use the rule of exponents that allows us to expand the sum a+b+c a + b + c in the exponent:

  • Given: 4a+b+c 4^{a+b+c}
  • According to the exponent rule xm+n+p=xm×xn×xp x^{m+n+p} = x^m \times x^n \times x^p , we can express:
  • Step: Break down 4a+b+c 4^{a+b+c} to:
  • 4a×4b×4c 4^a \times 4^b \times 4^c

Therefore, the expanded form of the equation is 4a×4b×4c 4^a \times 4^b \times 4^c .

3

Final Answer

4a×4b×4c 4^a\times4^b\times4^c

Key Points to Remember

Essential concepts to master this topic
  • Exponent Rule: When adding exponents, convert xa+b+c x^{a+b+c} to multiplication format
  • Technique: Apply xm+n=xm×xn x^{m+n} = x^m \times x^n to get 4a×4b×4c 4^a \times 4^b \times 4^c
  • Check: Verify by combining back: 4a×4b×4c=4a+b+c 4^a \times 4^b \times 4^c = 4^{a+b+c}

Common Mistakes

Avoid these frequent errors
  • Adding instead of multiplying when expanding exponents
    Don't write 4a+b+c=4a+4b+4c 4^{a+b+c} = 4^a + 4^b + 4^c = wrong answer! This confuses addition with exponent expansion. When exponents are added, the bases multiply. Always remember: xm+n=xm×xn x^{m+n} = x^m \times x^n , not xm+xn x^m + x^n .

Practice Quiz

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

FAQ

Everything you need to know about this question

Why do we multiply the bases instead of adding them?

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The exponent rule states that xm+n=xm×xn x^{m+n} = x^m \times x^n . This is because exponents represent repeated multiplication. For example: 42+3=45=4×4×4×4×4 4^{2+3} = 4^5 = 4 \times 4 \times 4 \times 4 \times 4 , which equals (4×4)×(4×4×4)=42×43 (4 \times 4) \times (4 \times 4 \times 4) = 4^2 \times 4^3 .

What's the difference between 4a+b+c 4^{a+b+c} and 4a+4b+4c 4^a + 4^b + 4^c ?

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4a+b+c 4^{a+b+c} means one base raised to a sum of exponents, which expands to multiplication. 4a+4b+4c 4^a + 4^b + 4^c means adding three separate exponential terms, which is completely different and cannot be simplified further.

Can I use this rule with any base number?

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Yes! This exponent rule works with any base. Whether it's 2a+b=2a×2b 2^{a+b} = 2^a \times 2^b , 10x+y=10x×10y 10^{x+y} = 10^x \times 10^y , or even xm+n=xm×xn x^{m+n} = x^m \times x^n with variables as the base.

How do I remember this rule?

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Think of it as "same base, add exponents when multiplying" working backwards. If xm×xn=xm+n x^m \times x^n = x^{m+n} , then xm+n=xm×xn x^{m+n} = x^m \times x^n . The bases stay the same, and you're just breaking apart the sum in the exponent.

What if there are more than three terms in the exponent?

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The same rule applies! For example: 4a+b+c+d+e=4a×4b×4c×4d×4e 4^{a+b+c+d+e} = 4^a \times 4^b \times 4^c \times 4^d \times 4^e . Just multiply as many terms as you have in the sum.

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