2. INTRODUCTION
Algebraic expression – a group of
numbers, symbols, and variables that express an
operation or a series of operations.
EXAMPLES: a-8
b-2
z+12 etc……
3. DEFINITIONS
Variable – A variable is a letter or symbol
that represents a number. It is an unknown
quantity
EXAMPLES: 5+z=13
4-y=1 etc……
4. Evaluating an algebraic
expression –
To find the value of an algebraic expression we can
substitute numbers for variables.
Examples: m+7,m-3 etc…
(‘m’ variable can be any number)
m + 8 if m = 2 then 2 + 8 = 10
z – 6 if z = 10 then 10 - 6 = 4
5. Likeandunliketerms
Like terms:
like terms are terms that have the
same variables and powers
Example: 8xyz2 and 5xyz2 are like terms
because they have the same variables
and power
6. unlike terms:
Unliketermsare two or more terms that are not like terms,
i.e. they do not have the same variables or powers.
Example: 3abcand 3ghiare unlike terms because they
have different variables
7. Difference between like and unlike
terms
1.Like terms can be added together to simplify an expression.
2.When adding like terms, add the numerical coefficients and
retain the variable.
3.Unlike terms cannot be added together since the variables
represent different items.
8. Words That Lead to Addition
Sum
Morethan
Increased
Plus
Altogether
9. Words That Lead to
Subtraction
Decreased
Less
Difference
Minus
How many more
13. Trinomial:
An expression with three terms is called a
trinomial
Polynomial:
A polynomial is an expression consisting of
variables and coefficients more than three
terms.
17. Ten more than a number n+10
A number decrease by 5 w-5
6 less than a number z-6
A number increased by 8 n+8
The sum of a number & 9 n+9
4 more than a number y+4
18. A number s plus 2 s+2
A number decrease by 1 k-1
31 less than a number x-31
A number b increased by 7 b=7
The sum of a number & 6 n=6
9 more than a number z=9