Question

plzzzz need help here :D
find :-
(2+i3)^3

Answer 1

Can you post a screenshot of your problem?

Answer 2

this is my problem :D

Answer 3

find
\( \Huge (2+i3 )^3\)

Answer 4

no i ment i , imaginary

Answer 5

try expanding it out,

(2+3i)(2+3i)(2+3i)

keep in mind that i^2 = -1 as you go

Answer 6

=8+3*4*3i+3*2*9*(-1)+(-1)*27i=-46+9i

Answer 7

there is no other way ?

Answer 8

lolz its kinda of easy thx guys !

Answer 9

i got
-46+9i

Answer 10

no no
i got
-10-27 i

Answer 11

Hmm I'm getting something different.
This is how I would work on it,
\[\Large\sf (2+3\mathcal i)^3\quad=\quad (2+3\mathcal i)^2(2+3\mathcal i)\]\[\Large\bf\sf =\quad (4+6\mathcal i-9)(2+3\mathcal i)\]\[\Large\sf =\quad (-5+6\mathcal i)(2+3\mathcal i)\]

Answer 12

seems not right answer :O