Question

I have one more question does the letter i is not also use for the symbol +- sign together

Answer 1

i = sqrt (-1)
sqrt(-4) = 2i
3 +/- sqrt (-4) = 3 +/- 2i

Answer 2

Like for instance where you have the 3 +/- can you not replace that with an i .

Answer 3

3 +/- sqrt (-4) = 3 +/- 2i is just an example
cuz i know ur working on quadratic
let b = -3 a = 1/2
sqrt (D) = sqrt (-4)
x = 3 +/- sqrt (-4)
x[1] = 3+ 2i
x[2] = 3-2i
u cant replace 3 +/- with i because i means sqrt (-1)
sqrt (-4) = sqrt (4)*sqrt(-1) = 2*i = 2i

Answer 4

i is used at complex no. only...or vectors perhaps :)