cube roots.notebook
April 19, 2016
Perfect Cube Roots
PHYSICAL model
cube roots.notebook
April 19, 2016
Second key
to find a cube root
x
√
x3 to find a cube
Cube root - a number when multiplied THREE times is equal
to a given number.
Means to find
the "cube root"
√x
3
How many cube roots are there for every positive number?
So √64 is asking (?) = 64
?=
How many cube roots are there for every negative number?
3
3
3
3
So √-125 is asking (?) = -125
?=
cube roots.notebook
April 19, 2016
Perfect cube : A cube of a whole number
root x3
1
2
3
4
5
6
root x3
7
8
9
10
11
12
Find the cube root for the following:
(a) 2197
(b) -1331
(c) 3375
(d) -5832
cube roots.notebook
April 19, 2016
Finding cube roots of fractions
3
3
8
125
1
512
3
27
64
Solving Equations Using Cube Roots
3
x = 729
3
x = 4913
cube roots.notebook
x
April 19, 2016
Solving Equations Using Cube Roots
3
x = 64
3
-1
x = 216
-1