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Contents
Introduction
Solving Simple Equations
Formulae
Factorising
Quadratic Equations
Completing the
Square method
General Solution
method
Problem Solving
Quiz
Algebra
Main Page
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Formulae A
formula expresses a rule in algebraic form To
evaluate a formula, we use the process of substitution. 
Example If
V=1/3 Ah, find V when A = 43 and h = 6. V
= 1/3(43)(6)
= 86 For
more help, please go to Evaluation
of Algebraic Expressions. Formulae
can be constructed to solve equations. The following examples show how to
construct them.
Example
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Descriptions
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Formula
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| (a)
The sum S of three numbers, a, b and c |
S =
a + b + c |
| (b) The product P of two numbers
x and y |
P =
xy |
| (c) The difference
D between the ages of two girls;
the older one being a and the younger one, b |
D =
a - b |
| (d) The average age
A of 4 boys whose ages are w, x, y and
z |
A =
(w + x + y + z)/ 4 |
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