Perform the addition or subtraction and write the result in standard form. $( 12 - i ) - ( 7 - i )$
A)5
B)7
C)9
D)8
E)6

Question

Perform the addition or subtraction and write the result in standard form. ​​ $( 12 - i ) - ( 7 - i )$ ​
A)5
B)7
C)9
D)8
E)​6

Quizplus · Accepted Answer

When you perform the subtraction $(12 - i) - (7 - i)$, you subtract the real parts and the imaginary parts separately. For the real parts: $12 - 7 = 5$. For the imaginary parts: $-i - (-i) = -i + i = 0$. So, the result is $5 + 0i$, which is simply $5$ in standard form.

Perform the Addition or Subtraction and Write the Result in Standard