Algebra uses letters called variables to represent numbers that correspond to specific values. Usually if you see letters towards the beginning of the alphabet in a problem like A, B or C. They represent known or set values, in the letters toward the end like X, Y or Z represent the unknowns. Things that can change or what are you are solving for, letters that represent variables and numbers are usually lower case.
While capitalized letters are used most commonly to represent the answer in a formula. Like the Capital A for area of a circle = П ( radius² ) or A = Π R². Here is a list of some the more commonly used variables in algebra and N doesn’t really fall at the beginning or end of the alphabet. But it is frequently used to represent some unknown quantity or number, probably because N is the first letter in number. The letter X is often the variable you solve for, maybe because it’s a letter of mystery, X marks the spot, the X-factor, the X-files whatever the reason. X is so popular as a variable that the letter is also used to indicate multiplication.
Just remember, you have to be clear when you are using a X, that isn’t taken to mean multiply. C and K are two of the more popular letters used for representing known amounts or constants. C is also used frequently in Calculus and Physics, it’s capitalized more for tradition and for any good reason. So when it comes to understanding variables – it’s good to know your ABC’s and a few more letters.
Transcription by:
Scribe4you Transcription Services