This MitPY comes from a student, Jay:
I have a question relating to polynomial equations. For context I have just finished Y11 during which I completed Further 3&4, Methods 1&2 and Specialist 1&2.
This year during my maths methods class we covered the square root graph, however I was confused as to why it only showed the positive solutions. When I asked about it I was told it was because the radical symbol meant only the positive solution.
However since then I have learnt that the graph of also only shows the positive solution of the square root, while shows both. I am quite confused by why they aren’t the same. The only reason that I could think of is that it would mean would be the same as , and while the points (-2,-4) and (2,-4) fit the latter they clearly don’t fit former.
Could you please explain why these aren’t the same?