Grade 11 Mathematics: Hard Exponents & Surds Exam Question | Prove b = ac/(a+c) | iCampSA
Автор: iCampSA
Загружено: 2026-01-23
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Unlock Grade 11 Mathematics! In this video, we tackle a challenging Exponents and Surds problem often seen in exams and homework.
The Problem: If 3^a = 21^b and 7^c = 21^b, prove that b = ac / (a + c).
What you will learn:
How to apply the Laws of Exponents effectively.
Techniques for substituting bases to solve proofs.
Step-by-step algebraic manipulation for Grade 10 and 11 students.
This lesson is perfect for South African students preparing for NSC or IEB exams, specifically for Mathematics Paper 1.
Lesson timestamps:
00:00 - Introduction & Problem Statement
02:13 - Identifying Common Bases
04:28 - Substitution Method
14:06 - Equating Exponents
20:22 - Final Proof and Conclusion
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