Vocabulary
the name for the unknown number that is represented by a letter
variable
2x + 5x
7x
3x + 9 = 30
x = 7
x2 + 7x +12
(x + 3)(x + 4)
4x - 2y = 10
y = 2x - 5
a term whose value will always remain the same (has no variable)
constant
2x - 5x
-3x
4(2x - 5) = 60
x = 10
x2 + 2x - 15
(x + 5)(x - 3)
Solve the system by elimination:
2x - 3y = 2
4x + 3y = 22
(4, 2)
the number in front of a variable in a variable term
EX: 5x (what is the 5 called?)
coefficient
2x·5x
10x2
x/3 + 5 = 20
x = 5
x2 - 8x + 12
(x - 6)(x - 2)
Find the slope between (-4, 2) and (4, 8).
m = 3/4
A mathematical statement containing numbers, symbols and operations (no equals sign)
expression
x3·x5
x8
3x + 10 = 2x
x = 5
2x2 + 7x - 4
(2x - 1)(x + 4)
x2 - 4x - 21 = 0
x = {-3, 7}
A mathematical sentence containing an equals sign.
equation
(x3)4
x12
9x - 17 = 6x - 2
x = -5
6x2 - x - 2
(3x - 2)(2x + 1)
Factor
8a4 + 20a3
4a2(2a2+5a)