Logarithm inequality divide an inequality by a negative value

MHB
Thread starter highmath
Start date Oct 26, 2018
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Inequality Logarithm Negative Value

In summary, a logarithm is a mathematical function that represents the power to which a base number must be raised to produce a given number. An inequality is a mathematical statement that compares two quantities or expressions and states that one is greater than, less than, or not equal to the other. When dividing an inequality by a negative value, you need to flip the inequality sign to change the direction. However, this can be tricky and it is important to be careful and remember to flip the sign. Logarithm inequalities differ from regular inequalities because they include a logarithm function, which may require additional steps and checks when solving. It is important to remember the properties of logarithms when solving logarithm inequalities.

Oct 26, 2018

highmath

What is error in the picture?

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Oct 26, 2018

MarkFL

Gold Member

MHB

The error arises because:

\(\displaystyle \log_{10}\left(\frac{1}{2}\right)<0\)

When we divide an inequality by a negative value, we need to reverse the direction of the inequality, so that we get:

\(\displaystyle 2<3\)

1. What is a logarithm?

A logarithm is a mathematical function that represents the power to which a base number must be raised to produce a given number. It is expressed as log_b(x) where b is the base and x is the number.

2. What is an inequality?

An inequality is a mathematical statement that compares two quantities or expressions and states that one is greater than, less than, or not equal to the other.

3. How do you divide an inequality by a negative value?

When dividing an inequality by a negative value, you need to flip the inequality sign. For example, if the inequality is x < 5 and you divide both sides by -2, the new inequality would be x > -2. This is because when you divide by a negative value, you are essentially multiplying by a negative value, which flips the direction of the inequality.

4. Why do you need to be careful when dividing an inequality by a negative value?

Dividing an inequality by a negative value can be tricky because it can change the direction of the inequality. This is why it is important to always remember to flip the inequality sign when dividing by a negative value.

5. How does a logarithm inequality differ from a regular inequality?

A logarithm inequality includes a logarithm function on one or both sides of the inequality. This means that the solutions may not be the same as a regular inequality and may need to be checked for validity. It is important to remember the properties of logarithms, such as log_b(x) = y is equivalent to b^y = x, when solving logarithm inequalities.