Solve (4×5)/(3×2) Raised to Negative 2: Complete Solution

Negative Exponents with Fraction Expressions

Insert the corresponding expression:

(4×53×2)2= \left(\frac{4\times5}{3\times2}\right)^{-2}=

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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, a fraction that is raised to the negative exponent (-N)
00:07 is equal to its reciprocal raised to the opposite power (N)
00:10 We will apply this formula to our exercise
00:14 We will convert to the reciprocal number and raise it to the opposite power
00:21 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(4×53×2)2= \left(\frac{4\times5}{3\times2}\right)^{-2}=

2

Step-by-step solution

To solve this problem, we will follow the standard rule for evaluating expressions with negative exponents:

  • Step 1: Identify the original expression – (4×53×2)2 \left(\frac{4 \times 5}{3 \times 2}\right)^{-2} .
  • Step 2: Apply the negative exponent rule which states (a/b)n=(b/a)n (a/b)^{-n} = (b/a)^{n} .
  • Step 3: Simplify the expression.

Now, let's proceed through each step:

Step 1: The expression within the parentheses is 4×53×2 \frac{4\times5}{3\times2} , which simplifies to 206 \frac{20}{6} or further reduced to 103 \frac{10}{3} . However, for the purpose of matching the choices given, we'll use the product form directly.

Step 2: Apply the negative exponent formula:
(4×53×2)2=(3×24×5)2 \left(\frac{4 \times 5}{3 \times 2}\right)^{-2} = \left(\frac{3 \times 2}{4 \times 5}\right)^2

Step 3: The result of this step shows the reciprocal raised to the power of 2:

The solution to the problem is therefore represented as:
(3×24×5)2 \left(\frac{3 \times 2}{4 \times 5}\right)^2 .

Upon reviewing the choices provided, this corresponds to choice 1.

3

Final Answer

(3×24×5)2 \left(\frac{3\times2}{4\times5}\right)^2

Key Points to Remember

Essential concepts to master this topic
  • Rule: Negative exponent flips the base and makes exponent positive
  • Technique: (a/b)n=(b/a)n (a/b)^{-n} = (b/a)^n so flip numerator and denominator
  • Check: Verify by calculating both sides: (20/6)2=(6/20)2 (20/6)^{-2} = (6/20)^2

Common Mistakes

Avoid these frequent errors
  • Applying negative exponent to individual terms instead of the whole fraction
    Don't distribute the negative exponent as 42×5232×22 \frac{4^{-2}\times5^{-2}}{3^2\times2^2} = wrong form! This treats the fraction incorrectly as separate parts. Always flip the entire fraction first, then apply the positive exponent: (3×24×5)2 \left(\frac{3\times2}{4\times5}\right)^2 .

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

What does a negative exponent actually mean?

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A negative exponent means "take the reciprocal and use the positive exponent." So x2 x^{-2} becomes 1x2 \frac{1}{x^2} .

Why do we flip the fraction instead of making the numbers negative?

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Negative exponents don't make numbers negative - they create reciprocals! When you have (4×53×2)2 \left(\frac{4\times5}{3\times2}\right)^{-2} , you flip to get (3×24×5)2 \left(\frac{3\times2}{4\times5}\right)^{2} .

Should I simplify the numbers inside first?

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You can, but it's not necessary for this problem type. Whether you work with 206 \frac{20}{6} or 4×53×2 \frac{4\times5}{3\times2} , the process is the same - flip and apply positive exponent.

How is this different from regular exponents?

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With positive exponents like (4×53×2)2 \left(\frac{4\times5}{3\times2}\right)^{2} , you keep the fraction as-is and square it. With negative exponents, you must flip first, then use the positive power.

What if I get confused about which way to flip?

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Remember: negative exponent means "flip and make positive." So (topbottom)n \left(\frac{\text{top}}{\text{bottom}}\right)^{-n} becomes (bottomtop)n \left(\frac{\text{bottom}}{\text{top}}\right)^{n} .

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