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

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22 comments

  1. monie says:

    where do u come up with 9

    • Ms.G says:

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

    • Kristine says:

      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

  2. monie says:

    hello

  3. macpati says:

    haha yeah!! How do you get 9??

  4. victoria says:

    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 🙂

  5. Jesse says:

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

  6. ashlee says:

    heyyyy i cant do division worth shitt!!!!

  7. Chance says:

    Thought this was great.

  8. Andrew says:

    i need help passing the math GED

  9. lady j says:

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

  10. Terrence Linder says:

    I’m bad at math! Need help bad!

  11. BJ says:

    Have any of you people studied ENGLISH???

  12. Brandon Dailey says:

    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!

  13. Jay says:

    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

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