1−X2 =1 22. X2− = −1 1 4X 23. 4X+ =1 X2+2X−4 24.3X− =5 2X2+ −X 3

21.1−x

2

=1 22. x

2

− = −1 1 4x 23. 4x+ =1 x

2

+2x−4 24.3x− =5 2x

2

+ −x 3