Easy rules to identify the type of expansion/factorisation
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Created by vivian cheah
almost 6 years ago
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Close
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Created by vivian cheah
almost 6 years ago
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Rule 1
a (b + c) = ab + ac
Rule 2
(a+b) (c+d)
= ac + ad + bc + bd
Rule 3
(a+b) (a+b) = a² + 2ab + b²
Rule 4
(a-b) (a-b) = a² - 2ab + b²
Rule 5
(a+b) (a-b) = a² - b²
