Solve the Expression: (35xy^7)/(7xy) × (8x)/(5y) Simplified

Fraction Multiplication with Variable Cancellation

Solve the following:

35xy77xy8x5y= \frac{35x\cdot y^7}{7xy}\cdot\frac{8x}{5y}=

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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 We'll make sure to multiply the numerator by numerator and the denominator by denominator
00:10 Let's break down 35 into factors of 7 and 5
00:18 We'll reduce wherever possible
00:33 When multiplying powers with equal bases
00:38 The power of the result equals the sum of the powers
00:41 We'll apply this formula to our exercise, we'll proceed to add together the powers
00:50 Let's calculate the power
00:54 When dividing powers with equal bases
00:58 The power of the result equals the difference of the powers
01:01 We'll apply this formula to our exercise, we'll subtract the powers
01:10 We'll apply the commutative law and proceed to arrange the equation
01:19 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following:

35xy77xy8x5y= \frac{35x\cdot y^7}{7xy}\cdot\frac{8x}{5y}=

2

Step-by-step solution

To solve this problem, follow these steps:

Step 1: Simplify the first fraction:

The first expression is 35xy77xy\frac{35x \cdot y^7}{7xy}.

  • Cancel the common factor of 77: 35÷7=535 \div 7 = 5.

  • This simplifies to 5xy7xy\frac{5x \cdot y^7}{x \cdot y}.

  • Cancel the common factor of xx: x/xx/x cancels to 11.

  • Cancel part of the yy terms: y7/y=y71=y6y^7/y = y^{7-1} = y^6.

  • The result is 5y65y^6.

Step 2: Simplify the second fraction:

The second expression is 8x5y\frac{8x}{5y}.

  • No common factors in the numerator and denominator, so it remains 8x5y \frac{8x}{5y} .

Step 3: Multiply these simplified results:

Now, multiply the results from Step 1 and Step 2: 5y68x5y5y^6 \cdot \frac{8x}{5y}.

  • The factor of 55 in 5y65y^6 and 8x5y\frac{8x}{5y} cancels: 5/5=15/5 = 1.

  • This results in y68xyy^6 \cdot \frac{8x}{y}.

  • Cancel part of the yy terms: y6/y=y61=y5y^6/y = y^{6-1} = y^5.

Thus, the simplified expression is 8xy58xy^5.

Therefore, the solution to the problem is 8xy5 \mathbf{8xy^5} .

3

Final Answer

8xy5 8xy^5

Key Points to Remember

Essential concepts to master this topic
  • Simplification Rule: Cancel common factors before multiplying fractions together
  • Technique: Use exponent laws like y7/y=y71=y6 y^7/y = y^{7-1} = y^6
  • Check: Multiply back: 5y68x5y=8xy5 5y^6 \cdot \frac{8x}{5y} = 8xy^5

Common Mistakes

Avoid these frequent errors
  • Not canceling common factors before multiplying
    Don't multiply 35×8=280 35 \times 8 = 280 in the numerator without canceling = huge messy fractions! This creates unnecessary complexity and calculation errors. Always cancel common factors like 35÷7=5 and x/x=1 x/x = 1 first.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why do I simplify each fraction separately first?

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Simplifying each fraction separately makes the multiplication much easier! Instead of dealing with 35xy77xy×8x5y \frac{35xy^7}{7xy} \times \frac{8x}{5y} , you get the simpler 5y6×8x5y 5y^6 \times \frac{8x}{5y} .

How do I handle the exponents when canceling?

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Use the subtraction rule: y7y1=y71=y6 \frac{y^7}{y^1} = y^{7-1} = y^6 . When variables have the same base, subtract the bottom exponent from the top exponent.

What if I can't see what cancels?

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List all the factors! Write 35=7×5 35 = 7 \times 5 and xy7=x×y×y6 xy^7 = x \times y \times y^6 . This makes it much easier to spot what cancels with what.

Can I multiply the fractions first, then simplify?

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You could, but it's much harder! You'd get 280x2y735xy2 \frac{280x^2y^7}{35xy^2} which is more complex to simplify than doing it step by step.

How do I know when I'm completely done simplifying?

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Your answer is fully simplified when there are no common factors left in numerator and denominator, and all exponents are positive. 8xy5 8xy^5 has no fractions left, so it's done!

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