Algebra Ia

Vocabulary

100

the name for an unknown (or hidden) number

that is represented with a letter,

such as  x or y 

variable

200

the name for a number

whose value will always remain the same

(not a variable)

constant

300

the number in front of a variable in a variable term

Example: 5x (what is the 5 called?)

co-efficient

400

Numbers, symbols and operations

(such as + and ×)

grouped together to represent the value of something

expression

500

A mathematical expression that shows the value of the expression using an equal sign

equation

Variable Operations

100

2x+5x

7x

200

2x-5x

-3x

300

2x*5x

10x^2

400

x^2*x^5

x^8

500

(x^3)^4

x^12

Equations

100

3x+9=30

x=7

200

4(2x-5)=60

x=10

300

x/3+5=20

x=45

400

3x+10=2x

x=-10

500

8x+5=3x+25

x=4

Factoring

100

4

2^2

200

12

2^2*3

300

75

3*5^2

400

256

2^8

500

144

2^4*3^2

Formulas

100

Area of a square with side s

A_square=s^2

200

Perimeter of a square with side s

P_square=4s

300

Area of a triangle with base b and height h.

A_triangle=1/2b*h

400

Area of a rectangle with base b and height h.

A_(rect)=b*h

500

Area of a circle with radius r

A_circ=pir^2