1) 2х^2 + 5х - 7 = 2( X - 1 )( X + 3,5 )
D = 25 + 56 = 81 = 9^2
X1 = ( - 5 + 9 ) : 4 = 1
X2 = ( - 5 - 9 ) : 4 = - 3,5
2) x^2 - 8x + 7 = ( X - 7 )( X - 1 )
D = 64 - 28 = 36 = 6^2
X1 = ( 8 + 6 ) : 2 = 7
X2 = ( 8 - 6 ) : 2 = 1
3) [ ( 2( X - 1 )( X + 3,5 ) ] / [ ( x - 7 )( X - 1 ) ] = ( 2( X + 3,5 )) / ( X - 7 ) = ( 2x + 7 ) / ( X - 7 )
Ответ ( 2х + 7 ) / ( Х - 7 )