I got these three answers wrong. Can someone give me a walkthrough please?
1. Simplify (-3 root -5)^2
Is it -45? or 45i? 45i^2? I'm so confused.
2. Identify the solution to the system of equations on the graph:
http://s1323.photobucket.com/user/gdelaine2013/med...
I put "infinite solutions" because they never touch. But someone told me it was "no real solutions" because they're parallel. I'm not sure which is true.
3. Which expression represents Y below?
2x - 3y = 23
-1x - y =1
I'm super confused because the answers have to look like this:
http://s1323.photobucket.com/user/gdelaine2013/med...
I have no idea how people get an answer like that!
Thank you for your help.
Update:this should be the proper link for #3
http://i1323.photobucket.com/albums/u593/gdelaine2...
Answers & Comments
1. (-3*SQRT[-5]) ^2 = (-3)^2 * SQRT[-5]^2 = 9 * -5 = -45
2. If two lines overlap such that they represent the same line, then they have infinite solutions. If the two lines never intersect, are parallel, then they have no real solution.
3. I can't see your pictures.