+118608 Thanks Mathwizard, it didn't occur to me that it was a minus sign, I just thought it was a dash!
$$\sqrt{-4\; }$$ has no solution in the real number system because nothing multiplied by itself equals a negative number.
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University people will tell you that $$\sqrt{-1}= i$$ This is the base unit for all imaginary numbers.
so we could say that $$\sqrt{-4}=\sqrt{-1}\times\sqrt4 = i\times2=2i$$
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I think it would be good if people started to learn LaTex. That is what I used to write that maths stuff.
This is how to write sqrt of 4
click on the LaTex Formula button in the tool bar
enter \sqrt4 then press ok
It is that simple, if you want square root of 16 this is what you must enter
\sqrt{16} then ok
If you didn't put the curly brackets then only the 1 would be under the sqare root sign. 
why don't you give it a go - if you would like to know how to write something else just ask. 
3-7=-4. so thev square root of -4........is square root -4.it cant be simplified!
signed,
Mathwizard91472
+118608 Thanks Mathwizard, it didn't occur to me that it was a minus sign, I just thought it was a dash!
$$\sqrt{-4\; }$$ has no solution in the real number system because nothing multiplied by itself equals a negative number.
--------------------------
University people will tell you that $$\sqrt{-1}= i$$ This is the base unit for all imaginary numbers.
so we could say that $$\sqrt{-4}=\sqrt{-1}\times\sqrt4 = i\times2=2i$$
-----------------------------------------
I think it would be good if people started to learn LaTex. That is what I used to write that maths stuff.
This is how to write sqrt of 4
click on the LaTex Formula button in the tool bar
enter \sqrt4 then press ok
It is that simple, if you want square root of 16 this is what you must enter
\sqrt{16} then ok
If you didn't put the curly brackets then only the 1 would be under the sqare root sign.
why don't you give it a go - if you would like to know how to write something else just ask.
