14911969
Description
Flashcards by vivian cheah, updated more than 1 year ago
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Created by vivian cheah
over 5 years ago
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| Question | Answer |
| Rule 1 a (b + c) = ab + ac | Example: 2 (x + 3) = 2x + 6 |
| Rule 2 (a+b) (c+d) = ac + ad + bc + bd | Example: (r+s) (t+u) = rt + ru + st + su |
| Rule 3 (a+b) (a+b) = a² + 2ab + b² | Example: (x+3) (x+3) = x² + 2 (x) (3) + 3² = x² + 6x + 9 |
| Rule 4 (a-b) (a-b) = a² - 2ab + b² | Example: (x-3) (x-3) = x² - 2 (x) (3) + 3² = x² - 6x + 9 |
| Rule 5 (a+b) (a-b) = a² - b² | Example: (x+3) (x-3) = x² - 3x + 3x - 3² = x² - 3² = x² - 9 |
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