Vaughan Wang
06/21/2024 · Junior High School
Dada la función \( f: \mathbb{R}-\{2\} \rightarrow \mathbb{R}-\{-1\} \), donde \( f(x)=\frac{x}{x-2} \) a. iLa función es inyectiva? Si es inyectiva
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Para determinar si la función \( f(x) = \frac{x}{x-2} \) es inyectiva, debemos verificar si para \( f(a) = f(b) \) se sigue que \( a = b \).
1. Supongamos que \( f(a) = f(b) \):
\[
\frac{a}{a-2} = \frac{b}{b-2}
\]
2. Multiplicamos ambos lados por \( (a-2)(b-2) \) (asumiendo que \( a \neq 2 \) y \( b \neq 2 \)):
\[
a(b-2) = b(a-2)
\]
3. Expandimos ambos lados:
\[
ab - 2a = ab - 2b
\]
4. Restamos \( ab \) de ambos lados:
\[
-2a = -2b
\]
5. Dividimos ambos lados por \(-2\):
\[
a = b
\]
Dado que hemos demostrado que \( f(a) = f(b) \) implica que \( a = b \), podemos concluir que la función \( f(x) \) es inyectiva.
Por lo tanto, la respuesta es que sí, la función \( f(x) = \frac{x}{x-2} \) es inyectiva.
Quick Answer
La función \( f(x) = \frac{x}{x-2} \) es inyectiva.
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