Square root of -28

How do you find the square root of negative 28

Simplify the following:
sqrt(-28)

sqrt(-28) = sqrt(-1) sqrt(28) = i sqrt(28):
i sqrt(28)

sqrt(28)  =  sqrt(4×7)  =  sqrt(2^2×7):
i sqrt(2^2 7)

sqrt(2^2 7)  =  sqrt(2^2) sqrt(7)  =  2^(2/2) sqrt(7)  =  2 sqrt(7):
Answer: | 
| i×2 sqrt(7)

=2i sqrt(7)

Remember that   sqrt( -1)   = i   ....so we have

sqrt(-28)  =

sqrt (-1 * 4 * 7)  =

sqrt (-1) * sqrt(4) * sqrt(7)  =

i * 2 * sqrt(7)   or    just     

2*sqrt(7) i