175k views
4 votes
Without using logarithm tables, solve for x in the equation below: 45log₅x + 2 log₅x - log₅x = 2 log₅4 - log₅x²

A) x = 1
B) x = 4
C) x = 5
D) x = 10

User MarekR
by
8.0k points

1 Answer

4 votes

Final answer:

After simplifying the given equation and using the property that the logarithm of a quotient is the difference of the logarithms, we can deduce that the equation simplifies to x = 4^(2/47), which does not match any of the given answers. It suggests there might be a typo in the question or incorrect answer choices.

The correct option is not given.

Step-by-step explanation:

To solve for x in the equation 45log₅x + 2 log₅x - log₅x = 2 log₅ 4 - log₅x² without using logarithm tables, we can make use of the properties of logarithms. First, we combine like terms on the left side of the equation:

45log₅x + 2log₅x - log₅x = 46log₅x - log₅x = 45log₅x

Next, we simplify the right side of the equation using the property that the logarithm of a quotient is the difference of the logarithms:

2 log₅ 4 - log₅ x² = 2 log₅ 4 - 2 log₅ x

Now we set the expression on the left side of the equation equal to the simplified right side and solve for x:

45log₅x = 2 log₅ 4 - 2 log₅ x

45log₅x + 2 log₅ x = 2 log₅ 4

47log₅x = 2 log₅ 4

log₅x = 2 log₅ 4 / 47

Since the base is the same, we can simplify further:

x = 4^(2/47)

However, none of the provided answer choices (1, 4, 5, 10) matches this value. It seems there is a mistake in the simplification process. The question may contain a typo or the given answers might be incorrect. To resolve this, recheck the initial question or consult with the student.

The correct option is not given.

User Anton Hlinisty
by
8.4k points