Chapter 5: Problem 39
Prep Exercise 4 What are two approaches for finding the square root of a fraction? For Exercises \(35-42,\) simplify. $$\sqrt{\frac{180}{5}}$$
Short Answer
Expert verified
Answer: 6
Step by step solution
01
Simplify the fraction
Divide 180 by 5, which will be the reduced fraction:
$$\frac{180}{5}=\frac{36}{1}$$
02
Apply square root
Now, find the square root of the simplified fraction:
$$\sqrt{\frac{36}{1}}=\frac{\sqrt{36}}{\sqrt{1}}$$
$$\sqrt{\frac{36}{1}}=6$$
So, the simplified form of the given expression is 6.
#Approach 2: Apply square roots separately#
03
Apply square root to numerator and denominator
Find the square root of the numerator and denominator separately:
$$\sqrt{\frac{180}{5}}=\frac{\sqrt{180}}{\sqrt{5}}$$
04
Simplify the square root of the numerator
To simplify the square root of 180, we find the prime factorization and pair the factors:
\(180 = 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5\)
Pairing the factors results in: \(180 = (2\cdot 2)\cdot (3\cdot 3)\cdot 5\)
Thus, \(\sqrt{180} = 2\cdot 3\cdot \sqrt{5} = 6\sqrt{5}\)
So, we have:
$$\sqrt{\frac{180}{5}}=\frac{6\sqrt{5}}{\sqrt{5}}$$
05
Simplify the expression
Now, we can see that the square root of 5 is present in both the numerator and the denominator. We can cancel it out:
$$\sqrt{\frac{180}{5}}=\frac{6\sqrt{5}}{\sqrt{5}} = 6$$
So, the simplified form of the given expression is also 6 using the second approach.
Unlock Step-by-Step Solutions & Ace Your Exams!
-
Full Textbook Solutions
Get detailed explanations and key concepts
-
Unlimited Al creation
Al flashcards, explanations, exams and more...
-
Ads-free access
To over 500 millions flashcards
-
Money-back guarantee
We refund you if you fail your exam.
Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!
Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Square Root of a Fraction
Understanding how to find the square root of a fraction is an essential skill in algebra. A fraction is a mathematical expression representing the division of one number by another. When we talk about the square root of a fraction, we are essentially looking at the square root of both the numerator and the denominator separately. This can simplify the calculation significantly.
To find the square root of a fraction, you can follow these straightforward steps:
To find the square root of a fraction, you can follow these straightforward steps:
- Identify the numerator and denominator in the fraction.
- Take the square root of the numerator.
- Take the square root of the denominator.
- Express the result as a new fraction.
Simplifying Fractions
Before dealing with the square root, it's often helpful to simplify the fraction first. Simplifying a fraction means reducing it to its smallest equivalent form, where the numerator and denominator have no common factors other than 1.
Here's how you can simplify a fraction:
Here's how you can simplify a fraction:
- Find the greatest common divisor (GCD) of the numerator and denominator.
- Divide both the numerator and the denominator by the GCD.
Prime Factorization
Prime factorization plays a crucial role, especially when simplifying the square root of a number. It involves expressing a number as a product of its prime factors. This method is particularly useful when dealing with square roots, as it helps identify pairs of factors.
Here is how you can do it:
Here is how you can do it:
- Break down the number into a set of prime numbers.
- Look for pairs of prime factors.
- Use these pairs to simplify the square root.