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Which expression is equivalent to [tex]\frac{x-5}{(x-5)(x-4)}[/tex]?

A. [tex]\frac{1}{x-4}[/tex]

B. [tex]x-4[/tex]

C. [tex]\frac{1}{-9(x-4)}[/tex]

D. [tex]-9(x-4)[/tex]


Sagot :

To simplify the given expression [tex]\(\frac{x-5}{(x-5)(x-4)}\)[/tex], let's proceed step-by-step:

1. Identify the numerator and the denominator:
- The numerator of the expression is [tex]\(x-5\)[/tex].
- The denominator of the expression is [tex]\((x-5)(x-4)\)[/tex].

2. Factor the common term:
- Notice that the term [tex]\(x-5\)[/tex] is present in both the numerator and the denominator.

3. Cancel the common factor:
- Since [tex]\(x-5\)[/tex] is a common factor in both the numerator and denominator, we can cancel it out. However, it's important to note that we can only do this if [tex]\(x \neq 5\)[/tex] because division by zero is undefined.

[tex]\[ \frac{x-5}{(x-5)(x-4)} = \frac{(x-5) \div (x-5)}{(x-5)(x-4) \div (x-5)} = \frac{1}{x-4} \][/tex]

4. Simplify the expression:
- After canceling out the [tex]\(x-5\)[/tex] term, the simplified expression is:

[tex]\[ \frac{1}{x-4} \][/tex]

5. Conclusion:
- The expression equivalent to [tex]\(\frac{x-5}{(x-5)(x-4)}\)[/tex] is [tex]\(\frac{1}{x-4}\)[/tex] as long as [tex]\(x \neq 5\)[/tex].

Thus, the final answer is:

[tex]\[ \frac{1}{x-4} \][/tex]
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