Thursday, August 11, 2011

What we learned in class today

Summary:

Expansion-->Remove brackets
| -->+,-,x,÷
| (like terms)
|
\ /
Factorisation-->extraction
-->grouping
-->Rules: (+ OR -)x(+ OR -)= +
(+ OR -)x(- OR +)= -
(+ OR -)÷(+ OR -)= +
(+ OR -)÷(- OR +)= -
Example: (a^2+2ab+b^2)
x^2 +6x+9
=(x)^2+2(x)(3)+(3)^2
=(x+3)^2

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