Why we write sq rt(-2) ?

1 Answer
May 8, 2018

See explanation below

Explanation:

sqrt(-2) is not a real number because there is no number x such that x^2=-2

We are dealing with complex numbers. By definition there is a number called i (imaginary unit) defined by i^2=-1

We can write then sqrt(-2)=sqrt(2·(-1))=sqrt2i