complex question. (1 Viewer)

[kev-]

Solve completely x^2+16 = 30i

This question looks so frustratingly easy, but I have no ideas. Any help?

 

[umm what]

x^2= -16 + 30i
let x=a + bi
then find the square roots

 

[nightweaver066]

Rearrange to x^2 = -16 + 30i

Let x = a + ib, expand LHS and equate real & imaginary terms/coefficients.

Simultaneous equations to get values for a and b

Edit: Wow, 2014 graduate? You're sure getting ahead

 

[kev-]

wow fast replies! thanks for the help. I don't know what "find the square roots be", but I understand nightweaver's explanation. I've just started 4unit today, so hopefully I'll be alright. Lol

 

[nightweaver066]

wow fast replies! thanks for the help. I don't know what "find the square roots be", but I understand nightweaver's explanation. I've just started 4unit today, so hopefully I'll be alright. Lol

It is technically finding the square roots.





Good luck and have fun with 4U

 

[umm what]

wow fast replies! thanks for the help. I don't know what "find the square roots be", but I understand nightweaver's explanation. I've just started 4unit today, so hopefully I'll be alright. Lol

Nightweaver explained 'finding square roots' lol