GCSE MATHs How to rearrange formulas Easy way | Rearrange formulas to isolate specific variables | Target Variable
If you use Method of units you will never be failed in formula rearrangement questions.
Hey! I've opened a new video series about Formulae and simultaneous equations. This topic refers to GCSE Algebra section of GCSE Maths: formula rearrangements
In this video I will introduce very efficient ways of how to rearrange formulae and express the target variable through others. Here, I will use several examples where I will demonstrate several types of formulae so that you will get general mechanism of isolating the target varible that you need to make as the subject. I will show you a fast track for rearrangements from basic to more difficult rearrangements. Don't forget to use the Physical units method ( or just simply Method of units ) that will allow you to check correctness of a formula after rearrangements and you never fail.
Quick TIPS:
A formula is an equation which connects two or more variables (plural formulae or formulas)
We can rearrange a formula to make one of the other variables as the subject of the formula. During rearrangements we have to ensure that the formula is still true and correct. If you use Method of units you will never be failed in formula rearrangement questions.
We rearrange formulae using the same processes which we used to solve equations.
The variables are replaced by numbers and then the equation was solved in order to define the value for the unknown variables. However, often we need to substitute several values for the unknowns and solve the equation then. In this situation it is quicker to rearrange the formula before substituting, and this what I encourage to do. That will give all necessary skills to think broadly and transfer that experience to other sciences like Physics, Chemistry or even Computer Science where you will definitely need it
When we derive a formula it is often useful to first test how the initial formula works with numbers: make sure that the formula after rearrangements will give you the expected value. Then, after rearrangements in general way check if the formula deliver the right units: basically apply units method to check the right formula construction. This double check will give you more confidence about the formula correctness
The playlist cover the following topics from GCSE MATHs Algebra formulae and simultaneous equations:
Contents:
- Formula substitution
- Formula rearrangement
- Formula derivation
- Difficult rearrangements
In this playlist we will consider equations with more than one unknown or variable. Any formula contains at least two variables: one variable as an Input and another one is an output. We will first try to consider formulae which describe the relationship between several variables and then we will be working on formulae substitution and formulae rearrangements. Next stop is to consider pairs of equations with two variables ( or even more than two depending on the problem ) which can be solved simultaneously to find the values of the unknowns.
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