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How to write algebraic expressions
|In mathematics, algebra is where
we use letters or symbols to represent unknown numbers
Variable: A variable is a symbol, usually a letter used to represent a number. Any letter may be used as a variable.
We use algebra to translate words into mathematics. For example suppose we use the variable n to represent any unknown number we do not know in the following sentences.
1) a number plus 3 becomes n + 3
2) four times a number becomes 4n
3) three less than a number becomes n-3
4) eight more than a number becomes 8 + n
5) Sally is four times as old as James less three years
In the above problem we let n=James’s age so
To write multiplication using variables always put the multiplier (number) before the variable.
Example: 4n correctly means 4 times n