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Diferència de quadrats
begin mathsize 24px style open parentheses a plus b close parentheses times open parentheses a minus b close parentheses space equals space a squared minus b squared end style
Exemples:
(4x + 9)(4x - 9) = (4x)2 - (9)2 = 16x2 - 81
(2x3 + 5y)(2x3 - 5y) = (2x3)2 - (5y)2 = 4x6 - 25y2



 
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