More maths to remember C1 Edexcel

More maths to remember C1 Edexcel

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When you have two intersecting lines, make them equal each other.
Quadratics equations can be solved by factorising, completing the square, or
applying the quadratic formula.
You can solve quadratic and linear equations simultaneously by applying the
substitution method.
Solving an inequality produces a solution set of values.
When multiplying or dividing both sides of an equality by a negative number, the
inequality sign must be reversed.
To solve inequalities involving quadratic expressions, you solve the corresponding
quadratic equation. You the use checking procedures and graph sketches to find
the solution set.
If a function of X has a negative outside the bracket, it is a reflection in the X axis. If
it has a negative inside the bracket, it is a reflection in the Y axis.
If a function of X is multiplied by A inside the bracket, the graph is stretched
sideways by a scale factor of one over A. If a function is multiplies by A outside the
bracket, the graph is stretched vertically by a scale factor or A.
If in doubt, create a table of values.
The general term of a sequence can be denoted by U N.
The recurrence formula for an arithmetic series is U N plus 1 equals U N plus K.
The general term U N of an arithmetic series is given by U N equals A plus bracket
N minus 1 bracket D. The first term is A, the common difference is D.
The differential is a gradient. It is denoted by D Y over D X or F dash X.
The second order derivative is denoted D squared Y over D X squared, or F double
dash X.

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