Question 134848
When adding complex numbers, add the real parts together and then add the imaginary parts together. Basically, treat the quantity "i" as just another variable.

Given: {{{(9+2i)+(1-7i)}}}
{{{(9+2i+ 1-7i)}}}
{{{ 9 + 1 + 2i -7i}}}
{{{ (9+1) + i(2-7) }}}
{{{ 10 - 5i }}}