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Difference of Two Squares
You can factorise an equation, such as $9 x^2$, if both values are roots. Difference means subtraction only. Equation: $$ r^1 r^2 r^1 + r^2 $$ Example $$ \begin{array}{0} 9+x^2 \\...
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GCSE Recap
Vector vs. Scaler A vector has both a magnitude and direction , whereas a scaler has only a magnitude .
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Circles
Components The circle is decomposed into several components: Centre the centre of the circle Radius the distance from the centre of the circle to the circumference diameter is $2 \...
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Ratios
A ratio shows the relationship between two or more quantities . For instance, $1:5$ is for every $1$ part of the first quantity, there is every $5$ parts of the second quantity. Al...
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