Add or subtract as indicated. Write your answer in the form $a+b i$.
-$(3-5 \mathrm{i})+(4+9 \mathrm{i})$
A) $7+4 \mathrm{i}$
B) $-7-4 \mathrm{i}$
C) 7 - $4 \mathrm{i}$
D) $-1+14 \mathrm{i}$

Question

Quizplus · Accepted Answer

To add complex numbers, add their real parts and their imaginary parts separately: $3 + 4 = 7$ and $-5i + 9i = 4i$. Thus, the sum is $7 + 4i$.

Add or Subtract as Indicated a+bia+b ia+bi - (3−5i)+(4+9i)(3-5 \mathrm{i})+(4+9 \mathrm{i})(3−5i)+(4+9i)

Add or Subtract as Indicated $a+b i$
- $(3-5 \mathrm{i})+(4+9 \mathrm{i})$