http://i77.photobucket.com/albums/j5...maths_snap.png

The answer should be -7/5 - 17i/10 but somehow I couldn't figure it out.

http://i77.photobucket.com/albums/j5...ars/Noname.png

The answer should be -2 -3i/2 but I always get -2 +3i/2 for my answer. Help please?

i is an imaginary number. That is i^2 = -1