x2-x-42
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Hey !!
X² - X - 42
=> X² - 7X + 6X - 42
=> X ( X - 7 ) + 6 ( X - 7 )
=> ( X - 7 ) ( X + 6 ) = 0
=> ( X - 7 ) = 0 or ( X + 6 ) = 0
=> X = 7 or X = -6
X² - X - 42
=> X² - 7X + 6X - 42
=> X ( X - 7 ) + 6 ( X - 7 )
=> ( X - 7 ) ( X + 6 ) = 0
=> ( X - 7 ) = 0 or ( X + 6 ) = 0
=> X = 7 or X = -6
sur68:
thnku
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