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zhenyaM2002

Verified answer

1) х^2 + 17х + 72 = ( x + 8 )( x + 9 )
D = 289 - 288 = 1 ; VD = 1
x1 = ( - 17 + 1 ) : 2 = - 8
x2 = ( - 17 - 1 ) : 2 = - 9
2) ( x + 8 )( x + 9 ) = ( x + 9 )( x - a )
Ответ а = ( - 8 )

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