MA11-04 Maths Watch
Rearranging Harder Formulae (Subject Appears Twice, or Under a Power/Root)
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In this lesson
In this video you'll learn about rearranging harder formulae for GCSE Maths, with worked examples and the mistakes examiners report. By the end you'll be able to rearrange a formula to change the subject when that subject appears twice, or when the subject is under a power or a root, by factorising or by squaring/rooting both sides.
What it covers
- 0:41 Straightforward rearranging undoes one operation at a time, and that is exactly what breaks here
- 4:07 Your letter can also sit in one place and still be out of reach, because it is squared
- 5:22 Flip that round now, so the root is wrapped around the letter you want
- 8:45 Exam technique
- 11:49 What's next
Key words
For: Edexcel IGCSE 4MA1, OCR GCSE J560, Cambridge IGCSE 0580
On the specification
| Board | Spec | Statement |
|---|---|---|
| Edexcel IGCSE 4MA1 | H2.3A | Understand the process of manipulating formulae or equations to change the subject, to include cases where the subject may appear twice or a power of the subject occurs |
| OCR GCSE J560 | 6.02c | Rearrange formulae to change the subject, where the subject appears once only. |
| Cambridge IGCSE 0580 | E2.5 | Construct expressions, equations and formulas. |
For teachers
This GCSE Maths lesson teaches rearranging harder formulae (subject appears twice, or under a power/root). By the end, students should be able to rearrange a formula to change the subject when that subject appears twice, or when the subject is under a power or a root, by factorising or by squaring/rooting both sides. It works through three worked examples and the mistakes examiners report.