ooo TMobile LTE 245 AM 24 D coursesapexlearningcom Il Semes

ooo T-Mobile LTE 2:45 AM 24% D + courses.apexlearning.com Il Semester 1 Exam SUBMIT Question 2 of 40 Multiple Choice: Please select the best answer and click \"submit.\" Simplify the following expression: 3(4-i)+6+2i) O A. 1+18 B. 13+i O C. 18- O D. 1-13i

Solution

3i(4-i) +i(6+2i)
=12i - 3*i^2 + 6i +2*i^2

put i^2 = -1

above expression becomes
12i - 3*(-1) + 6i +2*(-1)
=12 i + 3 + 6i -2
=18i +1
Answer: A