Simplify the Product: 3^x × 7^x × 5^x Using Exponent Rules

Exponent Rules with Same Base Products

Insert the corresponding expression:

3x×7x×5x= 3^x\times7^x\times5^x=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:09 Let's simplify this problem together.
00:12 Based on the rules of exponents, a product in parentheses raised to the power of N
00:18 is like saying each number in the product is raised to the power of N.
00:23 We'll use this rule to solve our exercise.
00:26 Remember, each part of the product gets the power of N.
00:32 And that's how we find the solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

3x×7x×5x= 3^x\times7^x\times5^x=

2

Step-by-step solution

To solve this problem, follow these steps:

  • Step 1: Identify the expression provided: 3x×7x×5x3^x \times 7^x \times 5^x.

  • Step 2: Apply the exponent rule for powers of a product: when multiple terms with the same exponent are multiplied, they can be combined under one power. This gives us: (3×7×5)x(3 \times 7 \times 5)^x.

Therefore, the simplified expression is (3×7×5)x\left(3 \times 7 \times 5\right)^x, which matches our final result.

3

Final Answer

(3×7×5)x \left(3\times7\times5\right)^x

Key Points to Remember

Essential concepts to master this topic
  • Rule: When bases are different but exponents same, combine bases first
  • Technique: an×bn=(a×b)n a^n \times b^n = (a \times b)^n becomes (3×7×5)x (3 \times 7 \times 5)^x
  • Check: Multiply bases: 3 × 7 × 5 = 105, so answer is 105x 105^x

Common Mistakes

Avoid these frequent errors
  • Adding exponents when bases are different
    Don't think 3x×7x×5x=153x 3^x \times 7^x \times 5^x = 15^{3x} ! This mixes up the rule for same bases with different exponents. Always combine the bases first when exponents are the same: (3×7×5)x (3 \times 7 \times 5)^x .

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why can't I just add the exponents like 3x?

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You only add exponents when you have the same base being multiplied, like 23×25=28 2^3 \times 2^5 = 2^8 . Here we have different bases (3, 7, 5) with the same exponent, so we combine the bases instead!

What's the difference between this and 3a×3b×3c 3^a \times 3^b \times 3^c ?

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Great question! In 3a×3b×3c 3^a \times 3^b \times 3^c , you have the same base (3) with different exponents, so you'd add exponents: 3a+b+c 3^{a+b+c} . In our problem, we have different bases with the same exponent.

Do I need to calculate 3 × 7 × 5 = 105?

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Not necessarily! The answer (3×7×5)x (3 \times 7 \times 5)^x is perfectly correct. You can simplify it to 105x 105^x if needed, but both forms are mathematically equivalent.

What if the exponents were different, like 3x×7y×5z 3^x \times 7^y \times 5^z ?

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Then you cannot combine them using exponent rules! The expression would stay as 3x×7y×5z 3^x \times 7^y \times 5^z . This rule only works when all exponents are identical.

Is this the same as distributing exponents?

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It's the reverse of distributing! When you distribute, (ab)n=anbn (ab)^n = a^n b^n . Here we're doing the opposite: anbn=(ab)n a^n b^n = (ab)^n . We're factoring out the common exponent.

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