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The function 𝑓f is defined by 𝑓(𝑥)=2𝑥+147f(x)= 72x+14​ , and 𝑓(𝑎)=6f(a)=6, where 𝑎a is a constant. What is the value of 𝑎a?

Question

The function 𝑓f is defined by 𝑓(𝑥)=2𝑥+147f(x)= 72x+14​ , and 𝑓(𝑎)=6f(a)=6, where 𝑎a is a constant. What is the value of 𝑎a?

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Solution

Para encontrar el valor de a a , primero utilizamos la definición de la función f(x) f(x) y la información dada f(a)=6 f(a) = 6 .

La función f(x) f(x) está definida como: f(x)=7x+14 f(x) = 7x + 14

Sabemos que: f(a)=6 f(a) = 6

Entonces, sustituimos x x por a a en la función: f(a)=7a+14 f(a) = 7a + 14

Dado que f(a)=6 f(a) = 6 , podemos escribir: 7a+14=6 7a + 14 = 6

Ahora, resolvemos esta ecuación para a a :

  1. Restamos 14 de ambos lados de la ecuación: 7a+1414=614 7a + 14 - 14 = 6 - 14 7a=8 7a = -8

  2. Dividimos ambos lados de la ecuación por 7: a=87 a = \frac{-8}{7}

Por lo tanto, el valor de a a es: a=87 a = -\frac{8}{7}

This problem has been solved

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