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VladimirAG [237]
3 years ago
15

What are the domain and range of the logarithmic function f(x) = log7x? Use the inverse function to justify your answers.

Mathematics
2 answers:
kolezko [41]3 years ago
5 0
The domain  is  x > 0  or (0,∞)

the range is  f(x) >= 0

the inverse of the function is  f-1(x)= (10^x ) / 7 

here we see that domain is >= 0  which is the range of f(x) and the range is > 0 whch equals the domain of f(x)

    
snow_tiger [21]3 years ago
3 0

We have been given the function

f(x)=\log 7x

Domain is the set of x values for which the function is defined. We know that a logarithm function is defined for all values greater than zero.

Thus, for the domain , we have

7x>0\\x>0

The domain is given by \left \{ x \in R, x>0 \right \}

The range is the set of y values for which the function is defined. For this logarithm function, we can take any values. Hence, the range of the function is all real number.

Now let us find the inverse of the function.

y=\log (7x)\\ \text{Swap x and y, we get}\\ x=log(7y)\\ \text{Now, we find the value of y}\\  7y=10^x\\ y=\frac{1}{7}10^x\\ f^{-1}(x)=\frac{1}{7}10^x

The domain of the inverse function is all real number and range is all values greater than zero.

We know that the domain of the function is range of the inverse function and the range of the function is domain of the inverse function.

Therefore, it justifies our solution.

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Step-by-step explanation:

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3 years ago
El sábado he gastado 3/5 del dinero que tenía para el fin de semana, el domingo 3/4 de
Vladimir79 [104]

Answer:

Her original amount of money can be represented by the variable x

Because we are spending one-fourth of her money, and “of” translate to multiply, we can write 1/4(x), or equivalently we can say 0.25x of her money, if you prefer decimal.

When you say 1/2 of it, this refers to the original amount of money, x, unless the problem wants you to figure how much 1/2 of the remaining amount is. So if the problem is directly asking for 1/2 of it, that would’ve half of x, or 0.5x in decimal.

Remaining was 50 pence, so the original amount minus 1/4 of the amount minus 1/2 the amount equals 50 pence or .50 giving us the equation: x-0.25x-0.5x=.50

Combine like terms on the left, and we have 0.25x=0.50.

Divide by 0.25 on both sides.

We have x equals 2.

So she started with $2. To check this, we ask ourselves does having $2, and spending 1/4 of it and spending 1/2 of it, then result to 50 pence?

Yes it does, because 2–1–0.5 does in fact equal 0.50 (50pence)

Su cantidad original de dinero puede ser representada por la variable x Debido a que estamos gastando una cuarta parte de su dinero, y "de" se traduce para multiplicar, podemos escribir 1/4 (x), o equivalentemente podemos decir 0.25x de su dinero , si lo prefiere decimal. Cuando dices la mitad, esto se refiere a la cantidad original de dinero, x, a menos que el problema quiera que calcules la mitad de la cantidad restante. Entonces, si el problema es pedir directamente la mitad, tendría la mitad de x, o 0.5x en decimal. El restante era 50 centavos, por lo que la cantidad original menos 1/4 de la cantidad menos la mitad de la cantidad es igual a 50 peniques o .50, lo que nos da la ecuación: x-0.25x-0.5x = .50 Combina términos semejantes a la izquierda, y tenemos 0.25x = 0.50 Divide por 0.25 en ambos lados, tenemos x igual a 2. ella empezó con 2 dólares. Para comprobar esto, nos preguntamos si tener 2 dólares y gastar 1/4 de ellos y gastar la mitad de ellos, ¿da como resultado 50 centavos? sí eso

Step-by-step explanation:

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