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Use the values [tex]$\log 128 \approx 2.1$[/tex] and [tex]$\log 4 \approx 0.6$[/tex] to find the approximate value of [tex]$\log _4 128$[/tex].

[tex]$\log _4 128 \approx \qquad$[/tex]

The solution is:

Answer :

We want to find the value of
[tex]$$
\log_4 128.
$$[/tex]

To do this, we use the change-of-base formula:
[tex]$$
\log_4 128 = \frac{\log 128}{\log 4}.
$$[/tex]

We are given that
[tex]$$
\log 128 \approx 2.1 \quad \text{and} \quad \log 4 \approx 0.6.
$$[/tex]

Substitute these values into the formula:
[tex]$$
\log_4 128 \approx \frac{2.1}{0.6}.
$$[/tex]

Now, compute the division:
[tex]$$
\frac{2.1}{0.6} \approx 3.5.
$$[/tex]

Thus, the approximate value is:
[tex]$$
\log_4 128 \approx 3.5.
$$[/tex]

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