7.2 Cube Roots Essential Question:

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Presented by Mr. Laws 8th Grade Math, JCMS

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Presentation transcript:

7.2 Cube Roots Essential Question: How is the cube root of a number different than the square root of a number? Vocabulary Cube root Perfect Cube

**Cubing a number and finding a cube root are inverse operations** Vocabulary Cube Root: A number that when multiplied by itself three times, it equals the given number. Perfect Cube: A number that can be written as the cube of an integer. 𝟑 : A radical sign, used to represent a cube root **Cubing a number and finding a cube root are inverse operations**

Fill in as we go: Find each cube root d. − 3 216 e. 3 27 1000 f. 3 −343

Example 2 Evaluate each expression 18−4 3 8 b. ( 3 125 ) 3 +21 c. 2 3 −216 −3

On Your Own Evaluate each expression a. 5 3 512 −19 b. ( 3 −64 ) 3 +43

On Your Own Evaluate the expression for the given value of the variable.

Example 4 Solve for the missing variable (2𝑥 +8) 3 =1728