An algebraic expression comprises both numbers and variables
together with at least one arithmetic operation.
A variable, as we learned in pre-algebra, is a letter that
represents unspecified numbers. One may use a variable in the same
manner as all other numerals:
To evaluate an algebraic expression you have to substitute each
variable with a number and perform the operations included.
Evaluate the expression when x=5
First we substitute x with 5
And then we calculate the answer
An expression that represents repeated multiplication of the
same factor is called a power e.g.
A power can also be written as
Where 5 is called the base and 3 is called the exponent. The
exponent corresponds to the number of times the base is used as a
Videolesson: Evaluate the expression when x=4