# Write as sum difference or multiple of logarithms explained

In this lesson, there are eight worked problems. Now, what we know is, this thing right over here or this thing right over here tells us that b to the x power is equal to a times c. The key to successfully expanding logarithms is to carefully apply the rules of logarithms.

Well, 3 to the third power is equal to Log of Exponent Rule The logarithm of an exponential number where its base is the same as the base of the log equals the exponent. So log base b of c is equal to z. And so if b to the y plus z power is the same thing as b to the x power, that tells us that x must be equal to y plus z.

This should be easy since Rule 3 or Power Rule can easily handle it. So this thing right over here evaluates to x. Now I can move the exponent of the argument of the first log out in front using property 3: In addition, the presence of a square root on the numerator adds some level of difficulty.

This is equal to the logarithm base b of a plus the logarithm base b of c. And if this part is a little confusing, the important part for this example is that you know how to apply this.

Used from left to right, this property can be used to "move" of the argument of a logarithm out in front of the logarithm as a coefficient. Now we have just to deal the rational expression using the Quotient Rule, then finish it off using the Product Rule. This property is used most used from left to right in order to change the base of a logarithm from "a" to "b".

Expand the log expression Okay, so this one is also in fraction so Quotient Rule is the first step. Remember that a radical can be expressed as a fractional exponent. Descriptions of Logarithm Rules The logarithm of the product of numbers is the sum of logarithms of individual numbers.

See the rest of the descriptions below. And then you can think about this a little bit more, and you can even try it out with some numbers.

What it does is break the product of expressions as a sum of log expressions. Expand the log expression I would immediately apply the Product Rule to separate the factors into a sum of logarithmic terms.

Used from right to left this can be used to combine the sum of two logarithms into a single, equivalent logarithm. Used from right to left this can be used to "move" a coefficient of a logarithm into the arguments as the exponent of the logarithm.

So b to the zth power is equal to c. Deal with the square roots by replacing them with fractional power, and then use Power Rule of log to bring it down in front of the log symbol as a multiplier.SOLUTION: Rewrite as a sum and/or difference of multiples of logarithms: ln((3x^2)/square root 2x+1)).my answer was 2ln(3x) + 1/2ln(2x+1) is this correct?

Algebra -> Logarithm Solvers, Trainers and Word Problems -> SOLUTION: Rewrite as a sum and/or difference of multiples of logarithms: ln((3x^2)/square root 2x+1)).my. write the expression as a sum and/or difference of logarithms. Express powers as factors. 0 votes. Use the properties of logarithms to expand the expression as a sum, difference, and/or constant multiple of logarithms.

asked Jan 29, use the properties of the logarithms to write each expression as a single term. asked Jun This video shows the method to write a logarithm as a sum or difference of logarithms.

The square root of the term given is taken out as half according to the rule. Then the numerator and denominator is divided into product of factors.

This is broken into the difference of numerator and denominator according to the rule. To write the sum or difference of logarithms as a single logarithm, you will need to learn a few rules.

The rules are ln AB = ln A + ln B. This is the addition rule. write the expression as a sum or difference of logarithms. express powers as factors show all work log4 sqrt pq/7 (27x) kahyla use the properties of logarithms to write the expression as a sum or difference of logarithms or multiples of logarithms.

show your work Ln 8x 2. log2y^5 pre calculous use the properties of logarithms to write the.

The Logarithm Laws by M. Bourne Since a logarithm is simply an exponent which is just being written down on the line, we expect the logarithm laws to work the same as the rules for exponents, and luckily, they do.

Write as sum difference or multiple of logarithms explained
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