Quadratic Functions

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Chapter 2 Edexcel
Jaeos
Note by Jaeos, updated more than 1 year ago
Jaeos
Created by Jaeos over 11 years ago
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Page 1

You need to know: 

The general formula of a quadratic is y=ax2+bx+c

where \{a, b, c,\} are constants and a0

Quadratic equations can be solved by:

(i) factorisation by D.O.T.S 'ac' method seeing it       

(ii) completing the square      x2±bx=(x±b2)2-(b2)2

(iii) using the quadratic formulax=b±b24ac2a

remember plotting sketching!

How to sketch and get method marks:

a>0 then , a\(b24ac>0 there are 2 real different roots, b24ac=0 there are 2 equal R roots, b24ac\(x-axis crossing y-axis crossing

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