## Algebraic Expressions

An **algebraic expression** is any grouping of numbers, variables or operations. Numbers, variables and constants, such as pi or ╥, are also referred to as **algebraic terms. **Below are some examples of algebraic expressions:

2n + 4

The first term is 2n, the second term is 4.

a – 2b

The first term is a, the second term is 2b.

There is no way to determine the value of the above expressions, since we don’t know what n is in example one or what a or b are in example 2. We could only determine a value for the expression after values for the variables are given.

For example:

Evaluate 2n + 4 when n is 9.

To solve all you do is replace n with 9.

2 x 9 + 4 = 22

where do u come up with 9

their telling you that n represents 9 ,2(9)+4= 22

9 is in the equation before even solving. Beacause the problem says that 2n+4 and substitute n= 9 so therefore you do 2*9+4= we automatically know that 2*9=18 and then we add that to 4 and then you end up with 22 so n= 22

hello

haha yeah!! How do you get 9??

The 9 is being used as an example. Basically, here the writer is simply “re-writing” the math problem and adding a 9 into the equation. They did not get the 9 from working the original problem. Hope this helps 🙂

Actually the correct answer is 9. 2 x 9 is 18, add 4 and you get 22.

That is so correct ,because you always do whats in the parenthesis first. Tip: Anyone that needs help in this area can study the PEMDAS section (order of operations) ,just seen this,i would of been given you guys the info,but working on some of the math areas myself also. Hope this helps 🙂

Parenthesis -Exponents-Multiplication-Division-Addition-Subtraction / These are the PEMDAS (order of operations)

I always remember “Please excuse my dear aunt Sally” it helps me..

Yeah please excuse my dear aunt sally was the one I remembered:)

Simply they just picked any Random Number they just decided on 9 @ their decision !Ll

heyyyy i cant do division worth shitt!!!!

Thought this was great.

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n=9 was picked randomly. That’s where the 9 came from. The author just made it up, and subsituted into the equation.

N= any number, in this specific case n=9 because the author said so

Can I have help?