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Section 1­3
Cube Roots
Objective: Find cube roots and solve cube root equations.
New Vocabulary: perfect cube, cube root
Vocabulary
Perfect cube: a number that is the cube
of a whole number
Example:
Cube Root (of a number): a number
that, when used as a factor three times,
is equal to the given number
Example:
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Perfect Cubes
*Note: you CAN take a cube root of a negative number
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To undo a square, we square root, so how
do we undo a cube?
Symbol:
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What is volume?
*You can take a cube root on a calculator.
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Roots, Exponents, and Negatives
Squares
• You can square any
number
• The answer to all squares
are positive
Cubes
• You can cube any number
• The answer to cubes will
be the same sign as the
original number
Square Roots
• Can't take a square root of a
negative
• The answer to a square root
includes a positive and a
negative
Cube Roots
• You can take the cube root
of any number
• The answer to a cube root
will be the same sign as the
original number
Assignment
Page 16-17
Numbers 6-20 and 22-26
Quiz Tomorrow