# ALGEBRA -

basics of algebra

expanding and simplying brakets

quadratic fomula

equations, collecting like terms

- Created by: Rayman08
- Created on: 09-05-12 19:37

First 114 words of the document:

ALGEBRA

COLLECTING LIKE TERMS

4a + 2a = 6a

3a2 + 6a2 = 9a2

If there are no like terms it cannot be simplified

WRITING FORMULA

Example: Frances buys x books at £2.50 each. She pays with a £20 note. If she receives c pounds

change write down as a formula.

c = 20 - 2.50x

For example if Frances bought 2 books:

x = 2, so substitute x as 2.

SUBSTITUTION

Replacing a letter with a number is called substitution.

Example if w = 5.6, t =- 7.1, u = 2

5

And equation is w+t

u

Using brackets substitute numbers in:

= 5.6-7.1

2

5

1.5

=- 0.4

= - 3.75

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