Question

(2+7i)power 3 write in form x+iy

Answer 1

Step-by-step explanation:

Let

$z = {(2 + 7i)}^{3}$

$= > z = {2}^{3} + {(7i)}^{3} + 3. {2}^{2}.7i + 3.2. {(7i)}^{2}$

$= > z = 8 - 343i + 84i - 294$

$= > z = - 286 - 259i$

$= > z = ( - 286) + ( - 259)i$