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b) Simplify the expression: [tex] y = 1 - \frac{x}{3x - 5} \]

Sagot :

Certainly! Let's break down and solve the given problem step-by-step.

The problem provides the function:

[tex]\[ y = 1 - \frac{x}{3x - 5} \][/tex]

and asks us to find its simplest form and the domain of [tex]\( x \)[/tex].

### Simplifying the Function
We start by simplifying the expression for [tex]\( y \)[/tex]:

1. Combine the terms in the fraction:

[tex]\[ y = 1 - \frac{x}{3x - 5} \][/tex]

2. Find a common denominator for the terms to combine the expression into a single fraction:

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

3. Simplify the numerator:

[tex]\[ y = \frac{3x - 5 - x}{3x - 5} \][/tex]

4. Combine the like terms in the numerator:

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

So, the simplest form of the given function is:

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

### Finding the Domain
Next, we need to determine the domain of [tex]\( x \)[/tex] such that the function [tex]\( y \)[/tex] is defined.

1. Identify points where the function might be undefined:

The function is undefined when the denominator is zero. For the denominator [tex]\( 3x - 5 \)[/tex], we set it to zero and solve for [tex]\( x \)[/tex]:

[tex]\[ 3x - 5 = 0 \][/tex]

[tex]\[ 3x = 5 \][/tex]

[tex]\[ x = \frac{5}{3} \][/tex]

2. State the domain excluding the undefined points:

The function is defined for all real values of [tex]\( x \)[/tex], except for [tex]\( x = \frac{5}{3} \)[/tex].

Thus, the domain of [tex]\( x \)[/tex] is:

[tex]\[ x \in \mathbb{R} \setminus \left\{\frac{5}{3}\right\} \][/tex]

### Conclusion
The simplest form of the function [tex]\( y = 1 - \frac{x}{3x - 5} \)[/tex] is:

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

The domain of [tex]\( x \)[/tex] is:

[tex]\[ x \in \mathbb{R} \setminus \left\{\frac{5}{3}\right\} \][/tex]

This completes the solution for the given problem.