Question

please give step by step​

Answer 1

Answer:

For this, you need a concept of imaginary numbers

x2+4=0

⇒x2+4−4=0−4

(Subtracting 4 from both sides)

⇒x2=−4

⇒x=√−4

⇒x=√−1×4

⇒x=±2√−1

(The value of √−1 is i )

⇒x=±2i

Hope this helps :)