Lesson 5 Solving Cube Root Equations

We will solve cube root equations algebraically.
I will summarize how to solve cube root equations algebraically.

​TEKS 2A.6B/7H

Lesson 5 Solving Cube Root Equations

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Answer the question the bellringer is asking.

Definitions

​Extraneous solutions: Solutions when checked in the original problem end up not making any sense.

​Step 4 is crucial** when you have a variable on BOTH sides of the original problem

Open Ended

Why do you think it is so important to check your solution(s)?

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What does x equal in example 1?

Multiple Choice

What is the answer for x for example 2?

• 2

• 9

• 8

• 7

Multiple Choice

For example 3, x=?

• 4

• 5

• 9

• 11

Go over to demos.com and let's see how we can solve these problems graphically....

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Another approach...

Poll

On a scale of 1-5 how do you feel about solving cube root equations algebraically?

• 5 - I feel great!

• 4 - Feel pretty good!

• 3 - Maybe need some more practice

• 2 - Need some clarification on a few things

• 1 - I'm lost here....