( 2x + 1 )( x2 + 2 ) = 0

c) ( 2x + 1 )( x2 + 2 ) = 0

d) ( x - 2 )( 3x + 5 ) = ( 2x - 4 )( x + 1 )

Bài 2: Giải các phương trình sau:

a) ( 2x + 7 )2 = 9( x + 2 )2

b) ( x2 - 1 )( x + 2 )( x - 3 ) = ( x - 1 )( x2 - 4 )( x + 5 )

c) ( 5x2 - 2x + 10 )2 = ( 3x2 + 10x - 8 )2

d) ( x2 + x )2 + 4( x2 + x ) - 12 = 0