Add or subtract as indicated and write the result in standard form.
-$$6 \mathrm { i } + ( - 9 - \mathrm { i } )$$
A) $- 9 + 5 i$
B) $- 9 + 7 i$
C) $9 - 5 \mathrm { i }$
D) $9 - 7 \mathrm { i }$

Question

Quizplus · Accepted Answer

To solve $6 \mathrm { i } + ( - 9 - \mathrm { i } )$, you combine like terms. The imaginary parts are $6i - i = 5i$ and the real parts are $-9$. Thus, the result is $-9 + 5i$.

Add or Subtract as Indicated and Write the Result in Standard