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Maths my Key Stuff C1
The difference of two squares is A squared minus B squared equals brackets A minus B,
brackets A plus B.
The Quadratic Formula is minus B plus or minus the square root of B squared minus four
A B all over two A.
The discriminant is B squared minus four A C and this is used to work out how many roots
an equation has. If the answer is more than zero it has two real roots. If it equals zero it has
one root, or two equal roots. If it is less than zero, there are no real roots.
If you add or minus X inside the brackets of a function of X, the graph moves to the left or
right, to the opposite of what you would expect.
If you add or minus X outside the brackets of a function of X, the graph moves up or down,
as you would expect.
The gradient of a normal is a negative reciprocal of the gradient of a tangent.
To find the co ordinates of a midpoint, add the two X co ordinates given, and divide by two.
Repeat for the Y co ordinates.
The distance between two points is the square root of X two minus X 1 squared, plus Y
two minus Y one squared.
To differentiate, remember N A X to the power of N minus 1.
To integrate, remember A X to the power N plus one, all over N plus one, then plus C.