

Topic: Calculus
Level: IB Mathematics: Applications and Interpretation (SL)
File Type: Editable Slides / Lesson Presentation
Overview
This resource introduces optimisation as a key application of differentiation in real-world contexts.
Students learn how to formulate, differentiate, and interpret objective functions to find maximum and minimum values in scenarios drawn from physics, economics, and everyday problem-solving.
The lesson emphasizes conceptual understanding of optimisation through modeling, helping students connect abstract calculus techniques to tangible practical problems.
Learning Objectives
By the end of this lesson, students will be able to:
- Understand the concept of optimisation as finding the maximum or minimum of a quantity under constraints.
- Formulate an objective function from a real-world scenario.
- Determine first-order conditions by differentiating and setting the derivative equal to zero.
- Identify and test critical points and endpoints to find optimal solutions.
- Interpret solutions in context and justify their reasonableness.
What’s Included
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Definition and conceptual explanation of optimisation.
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Step-by-step guide to solving optimisation problems:
- Define variables and construct an objective function.
- Differentiate to find first-order conditions.
- Test critical points and endpoints.
- Interpret and justify results within the given context.
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Example 1: Maximizing Volume of an Open-Top Box — cutting squares from a 20 × 20 cm sheet to form an open box; maximum volume achieved when squares of 2.89 cm are cut out.
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Example 2: Maximizing Profit in a Business Model — demand function and production cost problem showing that maximum profit occurs when 800 pens are sold.
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Example 3: Minimizing Fencing Cost for a Garden — given fixed area, finding dimensions (7.07 m × 14.14 m) that minimize total fencing cost.
Topics Covered
- Optimisation using first derivatives.
- Real-world modeling using calculus.
- Maximum and minimum value determination.
- Applications in business, manufacturing, and design.
- Interpreting mathematical results contextually.
Why You’ll Love It
- Bridges theory and application with relatable, real-world examples.
- Develops modeling skills essential for IB Math success.
- Includes detailed worked examples and clear problem-solving structure.
- Fully aligned with IB Math AI SL Topic 5: Calculus.
- Perfect for class instruction, revision, or individual exploration.
Tags: IB Math SL, Optimisation, Calculus Applications, Derivatives, Maximum and Minimum, Real-World Problems, Economics, Physics, IB Curriculum, Lesson Slides
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