Heya !!X² - 16X + 63 = 0X² - 9X - 7X + 63 = 0X ( X - 9 ) -7 ( X - 9 ) = 0( X - 9 ) ( X - 7 ) = 0( X - 9 ) = 0 OR ( X - 7 ) = 0X = 9 OR X = 7.
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