Determine which of the following is a reasonable solution to the logarithmic equation

log
2
(
x
4
)
=
3
.(1 point)
Responses

x
=
32
x equals 32

x
=
24
x equals 24

x
=

24
x equals negative 24

x
=

32

1 answer

To solve the logarithmic equation \( \log_2(x^4) = 3 \), we can use the properties of logarithms.

First, we can rewrite the equation in its exponential form:

\[ x^4 = 2^3 \]

Calculating \( 2^3 \):

\[ 2^3 = 8 \]

Now we have:

\[ x^4 = 8 \]

To solve for \( x \), we take the fourth root of both sides:

\[ x = 8^{1/4} \]

Calculating \( 8^{1/4} \):

Since \( 8 = 2^3 \), we have:

\[ 8^{1/4} = (2^3)^{1/4} = 2^{3/4} \]

If we want to find a numerical approximation, we can also calculate \( 2^{3/4} \):

Calculating \( 2^{3/4} \) gives us roughly \( 1.681 \).

We also need to note that \( x^4 = 8 \) has one positive solution and one negative solution, which can be determined from the equation:

\[ x = \sqrt[4]{8} \quad \text{or} \quad x = -\sqrt[4]{8} \]

Thus, the possible solutions are \( \sqrt[4]{8} \) and \( -\sqrt[4]{8} \).

Among the potential choices given:

  • \( x = 32 \)
  • \( x = 24 \)
  • \( x = -24 \)
  • \( x = -32 \)

None of these match \( x = \sqrt[4]{8} \) or \( x = -\sqrt[4]{8} \).

The solutions we derived do not match any of the provided options. Therefore, none of the given choices is reasonable.

However, if \( x \) must be a valid numerical relation or positive, then only \( x = 32 \) could be considered for evaluation or further computation in similar logarithmic contexts, but it does not solve the given equation.

Overall, the logarithmic equation \( \log_2(x^4) = 3 \) leads to valid solutions not represented in the options. Hence, none of the responses provided are reasonable solutions.