Find the sum or difference. Write the answer in standard form.
-$3 \sqrt { 2 } - ( 7 \sqrt { 2 } + i ) + 9 i - ( - 2 \sqrt { 2 } + 9 i )$
A) $- 2 \sqrt { 2 } - i$
B) $- 2 - 17 i \sqrt { 2 }$
C) $- 2 \sqrt { 2 } + i$
D) $2 - 17 i \sqrt { 2 }$

Question

Quizplus · Accepted Answer

The expression simplifies to $3\sqrt{2} - 7\sqrt{2} - i + 9i + 2\sqrt{2} - 9i = -2\sqrt{2} + i$, which matches option A.

Find the Sum or Difference 32−(72+i)+9i−(−22+9i)3 \sqrt { 2 } - ( 7 \sqrt { 2 } + i ) + 9 i - ( - 2 \sqrt { 2 } + 9 i )32​−(72​+i)+9i−(−22​+9i)

Find the Sum or Difference $3 \sqrt { 2 } - ( 7 \sqrt { 2 } + i ) + 9 i - ( - 2 \sqrt { 2 } + 9 i )$