# 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

Share and Enjoy:

• #### monie

###### May 6, 2013 at 5:45 pm

where do u come up with 9

• #### Ms.G

###### July 16, 2013 at 12:37 pm

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

• #### Kristine

###### October 4, 2013 at 10:41 am

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

• #### macpati

###### May 21, 2013 at 3:58 pm

haha yeah!! How do you get 9??

• #### victoria

###### May 21, 2013 at 5:23 pm

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 🙂

• #### Jesse

###### May 24, 2013 at 1:32 am

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

• #### Catresha

###### August 30, 2013 at 8:48 pm

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 🙂

• #### Catresha

###### August 30, 2013 at 8:58 pm

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

• #### andrea

###### October 13, 2013 at 11:07 am

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

• #### Audrea

###### December 7, 2013 at 12:23 am

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

• #### Lloyd Calvin Grant Jr

###### April 3, 2015 at 10:08 am

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

• #### ashlee

###### October 4, 2013 at 4:17 am

heyyyy i cant do division worth shitt!!!!

• #### Chance

###### December 16, 2013 at 10:20 pm

Thought this was great.

• #### Andrew

###### December 19, 2013 at 2:48 pm

i need help passing the math GED

###### December 21, 2013 at 10:14 pm

Omg I need help take the test 12/30\13 400 last 3 times. ..help please

• #### BJ

###### May 19, 2016 at 8:38 pm

Have any of you people studied ENGLISH???

• #### Brandon Dailey

###### August 25, 2016 at 9:46 am

Help? Please? I’ve taken the ged math portion like 3 times at this point, and I fail by like 3 points. I need some serious help insuring that I can pass this time! PLEASE!

• #### Paul

###### November 5, 2016 at 6:40 pm

Have you passed?

• #### Jay

###### October 14, 2016 at 11:36 am

Online Tutoring – 20 \$ per hour contact ycp360@gmail.com – Math major

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

• #### Cutto

###### December 27, 2016 at 11:29 am

Can I have help?