Solve Complex Fraction Equation: (√15 + 34/z)/(4y-12+4) = 5

Domain Restrictions with Complex Denominators

15+34:z4y12+8:2=5 \frac{\sqrt{15}+34:z}{4y-12+8:2}=5

What is the field of application of the equation?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:13 Let's find the domain where this function is defined.
00:17 Remember, we can't divide by zero. It's against the rules.
00:21 Since there's a variable in the bottom, it must not be zero.
00:25 This is our first check for variable Z.
00:29 Now, we look at the big numerator with another variable.
00:40 Here too, the denominator must not be zero.
00:49 We solve it using the right math steps.
00:56 Let's find what Y should be.
01:03 And there you have it! That's how we find the answer.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

15+34:z4y12+8:2=5 \frac{\sqrt{15}+34:z}{4y-12+8:2}=5

What is the field of application of the equation?

2

Step-by-step solution

To solve this problem, we need to identify the values of yy for which the denominator of the expression becomes zero, as these values are not part of the domain.

First, let's simplify the denominator of the given equation:

Original equation: 15+34z4y12+82=5 \frac{\sqrt{15} + \frac{34}{z}}{4y - 12 + \frac{8}{2}} = 5

Simplifying the terms: 34:z remains as it is for simplification purposes, and 82=4 34:z \text{ remains as it is for simplification purposes, and } \frac{8}{2} = 4

Thus, the denominator becomes: (4y12+4)=4y8 (4y - 12 + 4) = 4y - 8

We need to ensure the denominator is not zero to avoid undefined expressions: 4y80 4y - 8 \neq 0

Simplify and solve for yy: 4y80    4y8    y2 4y - 8 \neq 0 \implies 4y \neq 8 \implies y \neq 2

Therefore, the equation is undefined for y=2y = 2, and the answer is that the field of application excludes y=2y = 2.

Given the possible choices for the problem, the correct choice is: y2 y\operatorname{\ne}2

The solution to this problem is y2 y \neq 2 .

3

Final Answer

y2 y\operatorname{\ne}2

Key Points to Remember

Essential concepts to master this topic
  • Domain Rule: Set denominators equal to zero and solve for excluded values
  • Technique: Simplify denominator first: 4y - 12 + 4 = 4y - 8
  • Check: Verify y = 2 makes denominator zero: 4(2) - 8 = 0 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify the denominator before finding restrictions
    Don't set 4y - 12 + 4 ≠ 0 without simplifying = wrong excluded values! The arithmetic must be completed first to get the true form. Always simplify denominators completely, then set equal to zero to find domain restrictions.

Practice Quiz

Test your knowledge with interactive questions

\( 2x+\frac{6}{x}=18 \)

What is the domain of the above equation?

FAQ

Everything you need to know about this question

What does 'field of application' mean in this context?

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The field of application means the domain of the equation - all values of y for which the equation is defined and makes mathematical sense.

Why can't the denominator equal zero?

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Division by zero is undefined in mathematics! When the denominator equals zero, the fraction has no meaning, so we must exclude those values from the domain.

Do I need to worry about the variable z in the numerator?

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No! The question asks specifically about the field of application, which focuses on when the equation is undefined. Only denominators can make expressions undefined through division by zero.

How do I write 'y is not equal to 2' in math notation?

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You can write it as y2 y \neq 2 or y2 y \operatorname{\ne} 2 . Both symbols mean 'not equal to' and are mathematically correct.

What if there were multiple fractions in the denominator?

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Set each denominator equal to zero separately and solve. The domain excludes all values that make any denominator zero.

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