Lesson Planet
Search educational resources
  • Sign In Try It Free
  • AI Teacher Tools
    • Discover Resources Search reviewed educational resources by keyword, subject, grade, type, and more
    • Curriculum Manager (My Content) Manage saved and uploaded resources and folders To Access the Curriculum Manager Sign In or Join Now
    • Browse Resource Directory Browse educational resources by subject and topic
    • Curriculum Calendar Explore curriculum resources by date
    • Lesson Planning Articles Timely and inspiring teaching ideas that you can apply in your classroom
    • Our Story
    • Frequently Asked Questions
    • Testimonials
    • Contact Us
  • Pricing
  • School Access
    • Your school or district can sign up for Lesson Planet — with no cost to teachers
      Learn More
  • Sign In
  • Try It Free

Hi, what do you want to do?

Create a lesson plan
Create a lesson plan
Generate resources with 80+ AI teacher tools
Generate resources with 80+ AI teacher tools
Search 200,000 instructional videos
Search 200,000 instructional videos
Find a teaching resource
Find a teaching resource
Change of Base Formula Proof, Logarithms, Algebra II Instructional VideoChange of Base Formula Proof, Logarithms, Algebra II Instructional Video
Publisher
Khan Academy
Resource Details
Curator Rating
Educator Rating
Not yet Rated
Grade
9th - 12th
Subjects
Math
2 more...
Resource Type
Instructional Videos
Media Length
4:59
Audiences
For Teacher Use
1 more...
Duration
10 mins
Instructional Strategies
Flipped Classroom
1 more...
Accessibility
Closed Captions
1 more...
Year
2013
Usage Permissions
Creative Commons
BY-NC-SA: 3.0
cc
Instructional Video

Change of Base Formula Proof, Logarithms, Algebra II

Curated and Reviewed by Lesson Planet

This video proves the helpful change of base formula for logarithms. The proof steps may need to be more intuitive to most logarithm learners, but the algebraic manipulation shown using logs is interesting.

3 Views 0 Downloads

Concepts

logarithms

Additional Tags

logarithm, logarithm property, proof of change of base formula for logarithms, math

Classroom Considerations

  • This video is hosted on YouTube

See similar resources:

Lesson Plan

The Graph of the Natural Logarithm Function

EngageNY
If two is company and three's a crowd, then what's e? Scholars observe how changes in the base affect the graph of a logarithmic function. They then graph the natural logarithm function and learn that all logarithmic functions can be...
10th - 12th Math
CCSS: Designed
Lesson Plan

Trigonometric Identity Proofs

EngageNY
Proving a trig identity might just be easier than proving your own identity at the airport. Learners first investigate a table of values to determine and prove the addition formulas for sine and cosine. They then use this result to...
10th - 12th Math
CCSS: Designed
Lesson Plan

Solving Logarithmic Equations

EngageNY
Of course you're going to be solving an equation—it's algebra class after all. The 14th installment of a 35-part module first has pupils converting logarithmic equations into equivalent exponential equations. The conversion allows for...
10th - 12th Math
CCSS: Designed
Worksheet

Derivation of the Quadratic Formula

West Contra Costa Unified School District
What connection does the quadratic formula have with a quadratic equation? Using a matching activity, pupils construct the algebraic derivation of the quadratic formula in this Algebra II lesson task. The task provides two variations of...
9th - 11th Math
CCSS: Adaptable
Lesson Plan

Why Were Logarithms Developed?

EngageNY
Show your class how people calculated complex math problems in the old days. Scholars take a trip back to the days without calculators in the 15th installment of a 35-part module. They use logarithms to determine products of numbers and...
10th - 12th Math
CCSS: Designed
Instructional Video

Proof of Quadratic Formula, Polynomial and Rational Functions, Algebra II

Khan Academy
Armed with their newfound (or refreshed) knowledge of the quadratic formula, viewers can now work with Sal to prove the formula - an essential skill that is often ignored in algebra. Once they learn how to both use and prove the...
8 mins 8th - 11th Math
Interactive

Solving Logarithmic Equations

CK-12 Foundation
Pupils follow a chain of reasoning in deconstructing a logarithmic equation step by step. Using their knowledge of logarithms, learners compare the solutions of logarithmic equations when the bases are changed.
11th - Higher Ed Math
CCSS: Designed
Lesson Plan

Quadratic Formula

Curated OER
This worksheet is part of the TI-Nspire lesson on the quadratic formula. Pupils determine the solutions of a quadratic function by looking at a graph and the discriminant. They use the quadratic formula to solve quadratic functions on...
9th - 12th Math
CCSS: Designed
Instructional Video

What is the Formula for the Volume of a Cone?

Curated OER
All you need are a few values to find the the volume of a cone! Watch an informative math video that guides learners through the formula needed, as well as the relationship between the cone's volume and the volume of other...
5 mins 6th - 9th Math
CCSS: Adaptable
Lesson Plan

Quadratic Formula

Curated OER
Mathematicians determine the solutions of a quadratic function by looking at a graph. They use the quadratic formula to solve quadratic functions on their Ti-Nspire.
9th - 12th Math
CCSS: Designed
Try It Free
© 1999-2026 Learning Explorer, Inc.
Teacher Lesson Plans, Worksheets and Resources

Sign up for the Lesson Planet Monthly Newsletter

Open Educational Resources (OER)

  • Health
  • Language Arts
  • Languages
  • Math
  • Physical Education
  • Science
  • Social Studies
  • Special Education
  • Visual and Performing Arts
View All Lesson Plans

Discover Resources

  • Our Review Process
  • How it Works
  • How to Search
  • Create a Collection

Manage Curriculum

  • Edit a Collection
  • Assign to Students
  • Manage My Content
Contact Us Site Map Privacy Policy Terms of Use