This is a draft cheat sheet. It is a work in progress and is not finished yet.
To finish
As well ask factorising you may be asked to solve the equation.
This just means finding the value of X when each bracket is 0.
(X+3)=0 —-> X=-3 |
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Use this formula on the calculator
When to use the formula
If you have a quadratic that wont easily factorise |
if the question mentions decimal places or significant figures |
if the question asks for an exact answers or surds(this could be completing the squares) |
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Summery
Write down a SQUARED bracket
And then stick a number on the end to COMPLETE it
Steps
First take out the number in front of the X2 |
eg: 2x2+8x+5=0 —> 2(x2+4x)=0 |
then halve the b term and put into a squared bracket |
eg: 2((x+2)2-4)) |
then times everything |
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