Vocabulary
the name for the unknown number that is represented with a letter
variable
2x + 5x =
7x
x + 9 = 9
x = 0
-2+2
32
9
the name for a number whose value will always remain the same (no variable)
constant
2x - 5x=
-3x
-x=10
-10
1+4-1
(-4)2
16
the number in front of a variable in a variable term
EX: 5x (what is the 5 called?)
co-efficient
2x·5x=
10x2
x + 5 = -20
x = -25
2(-2)
-4
(-5)2
25
In the expression 2x + 2x2 - 2x, which are like terms?
2x, -2x
x3·x5=
x8
3x + 9 = 30
7
2(-2)(2)
-8
the square roots of 100 are positive ____ and negative _____.
+10, -10
two mathematical expressions that have equal value
equation
(x3)(2x4)
2x7
2x-10=x
x=5
2(-2)(-2)
8
The square roots of 9 are positive _____ and negative ____.
+3,-3