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.
Evaluate 2n + 4 when n is 9.
To solve all you do is replace n with 9.
2 x 9 + 4 = 22