The sign definitely can cause a lot of confusion for students. For starters,
and the list goes on.
So my focus today is to explain when to put while dealing with
. First, lets recognise a few things.
: This gives us
: This gives us
Yes, the square-root can be raised to a square for the x, but notice the difference in answer in both cases. The former is a while the latter has
too. This is because the square-root is always a positive square-root and does not return
. On the other hand,
and the
which causes the
.
So next time, please be alert when you introduce the .
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