Flashcards
The 5 Rules of Algebraic Expansion and Factorisation
Cards in this deck (5)
- 1Rule 1 a (b + c) = ab + acExample:
2 (x + 3) = 2x + 6 - 2Rule 2 (a+b) (c+d) = ac + ad + bc + bdExample:
(r+s) (t+u)
= rt + ru + st + su - 3Rule 3 (a+b) (a+b) = a² + 2ab + b²Example:
(x+3) (x+3) = x² + 2 (x) (3) + 3²
= x² + 6x + 9 - 4Rule 4 (a-b) (a-b) = a² - 2ab + b²Example:
(x-3) (x-3) = x² - 2 (x) (3) + 3²
= x² - 6x + 9 - 5Rule 5 (a+b) (a-b) = a² - b²Example:
(x+3) (x-3) = x² - 3x + 3x - 3²
= x² - 3²
= x² - 9
Information
- Description
- Easy rules to identify the type of expansion/factorisation
- Created by
- vivian cheah · Sep 2018
- Updated
- Sep 4, 2018
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