X² + 2√3x² - 24=> x² + ( 4√3 - 2√3 )X - 24=> x² + 4√3 x - 2√3 x - 24=> x( x + 4√3 ) - 2√3( x + 4√3 ) => ( x + 4√3 ) ( x - 2√3 )
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