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```The expression 103 is called a
power.
10 is called the base and 3 is
called the exponent.
103 means 10 • 10 • 10
103 = 1000
Two to the first power
22
Two to the second power or two
squared
23
Two to the third power or two cubed
2n7
Two times n to the seventh power
1.
2.
3.
4.
4 – x3
4 – 3x
3x – 4
x3 – 4
Examples:
1) 34
2) (0.2)5
3) (⅔)3
You can get 2 different answers
depending on which operation
you did first. We want
everyone to get the same
order of operations.
ORDER OF OPERATIONS
1. Parentheses - ( ) or [ ]
2. Exponents or Powers
3. Multiply and Divide (from left to
right)
4. Add and Subtract (from left to
right)
Evaluating an Algebraic Expression
To evaluate a algebraic expression:
1. substitute the given numbers for each
variable.
2. use order of operations to solve.
Example # 1
n + (13 - n)  5
for n = 8
Example # 2
8y - 3x2 + 2n
for x = 5, y = 2, n =3
2n  m
t
1.
2.
3.
4.
10
-10
-6
6