Pass Check: Formulae & Substitution
A formula is a rule connecting variables, used by substituting or rearranging.
Formula
A mathematical rule connecting two or more variables, e.g. A = πr².
Subject of a formula
The letter on its own on one side of the equals sign, e.g. A in A = πr².
Rearrange
To change a formula so a different letter becomes the subject.
Substitute
To replace letters in a formula with given numerical values.
Quick check
Mixed quiz
1. Which formula correctly gives the area of a rectangle with length l and width w?
2. Which is the correct rearrangement of A = πr² for r²?
3. Which is the correct rearrangement of P = A(1+rt) for A?
4. Which factorises x² - 16?
5. Which factorises to 3(x+4)?
6. Which factorises 6x² + 11x + 3?
7. Find the next term in the sequence 8, 14, 20, 26,...
8. Find the nth term of the sequence 7, 12, 17, 22,...