# Maths Algebra Revision Cards GCSE Edexcel

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• Created by: Zolo
• Created on: 01-04-13 16:05

## 1

Parallel lines have the same gradient.

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## 1

If in doubt FACTORISE or use PYTHAGORAS

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## 2

Before solving a quadratic equation make it equal to zero

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## 3

If a question requires you to solve, but doesn't give an equation, use your initiative

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## 4

Suitable degree of accuracy means
To the same accuracy as quantities in the question
OR
to 3 significant figures

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## 5

Don't round until the end of a question.
Try to use full answers throughout your calculations, then round appropriately at the end.

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## 6

To solve a quadratic equation, use the following methods in order of preference.
Factorise
Complete the square

Before trying to solve, get it equal to zero.

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## 7

When rearranging
Use brackets
Cancel if you can
FACTORISE if you can

Always, when making something the subject, make sure you have it alone on one side only.

To do this, make sure you start with the intention of getting everything with your subject in together.

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## 8

Never use factorisation or quadratic formula to solve until what you want to solve equals zero.

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## 9

If using quadratic formula beware of negatives

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## 10

IDENTITY - 3 lines
EXPRESSION - no equality sign
FORMULA - more than one unknown, would need information about at least one variable to find others
EQUATION - one unknown that can be solved

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## 11

See a bracket - deal with it first!
5(x+2)=15
5x+10=15
5x =15
X=1

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## 12

Solve inequalities like equations but remember the sign at the end.
Only change sign if multiplying/dividing by a negative.

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## 13

When working with algebra use brackets to stop silly mistakes
Always FACTORISE or cancel when you can

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