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Which expression is equivalent to the following complex fraction?

[tex]\[ \frac{\frac{2}{x} - \frac{4}{y}}{\frac{-5}{y} + \frac{3}{x}} \][/tex]

A. [tex]\(\frac{3y + 5x}{2(y - 2x)}\)[/tex]

B. [tex]\(\frac{2(y - 2x)}{3y - 5x}\)[/tex]

C. [tex]\(\frac{2(y - 2x)(3y - 5x)}{x^2 y^2}\)[/tex]

D. [tex]\(\frac{x^2 y^2}{2(y - 2x)(3y - 5x)}\)[/tex]


Sagot :

Let's break down the given complex fraction and simplify it step by step.

Given the complex fraction:
[tex]\[ \frac{\frac{2}{x} - \frac{4}{y}}{\frac{-5}{y} + \frac{3}{x}} \][/tex]

First, combine the terms in the numerator and denominator.

The common denominator for the fractions in the numerator is [tex]\(xy\)[/tex]:
[tex]\[ \frac{2}{x} - \frac{4}{y} = \frac{2y}{xy} - \frac{4x}{xy} = \frac{2y - 4x}{xy} \][/tex]

Similarly, the common denominator for the fractions in the denominator is [tex]\(xy\)[/tex]:
[tex]\[ \frac{-5}{y} + \frac{3}{x} = \frac{-5x}{xy} + \frac{3y}{xy} = \frac{-5x + 3y}{xy} \][/tex]

So the complex fraction becomes:
[tex]\[ \frac{\frac{2y - 4x}{xy}}{\frac{-5x + 3y}{xy}} \][/tex]

To simplify, multiply by the reciprocal of the denominator:
[tex]\[ \frac{2y - 4x}{xy} \div \frac{-5x + 3y}{xy} = \frac{2y - 4x}{xy} \cdot \frac{xy}{-5x + 3y} \][/tex]

The [tex]\(xy\)[/tex] terms cancel out:
[tex]\[ \frac{2y - 4x}{-5x + 3y} \][/tex]

Now we need to find which of the given expressions is equivalent to this simplified form:
[tex]\[ \frac{2y - 4x}{-5x + 3y} \][/tex]

Let's look at each given expression one by one:

1. [tex]\(\frac{3y + 5x}{2(y - 2x)}\)[/tex]

2. [tex]\(\frac{2(y - 2x)}{3y - 5x}\)[/tex]
[tex]\[ \text{This can be rewritten as } \frac{2y - 4x}{3y - 5x} \][/tex]

3. [tex]\(\frac{2(y - 2x)(3y - 5x)}{x^2 y^2}\)[/tex]

4. [tex]\(\frac{x^2 y^2}{2(y - 2x)(3y - 5x)}\)[/tex]

Comparing the simplified form [tex]\(\frac{2y - 4x}{-5x + 3y}\)[/tex] with each option, we see that expression 2 is equivalent when you consider that:

[tex]\[ \frac{2(y - 2x)}{3y - 5x} = \frac{2y - 4x}{3y - 5x} \][/tex]

Thus, the equivalent expression is:

[tex]\(\boxed{\frac{2(y - 2x)}{3y - 5x}}\)[/tex]