Question

Find the complex conjugate of 3(7+7i)+i(7+7i)

Answer 1

Answer:

3(7+7i) + i(7+7i)= 21+21i + 7i + 7i^2. 21+28i + 7i^2, we know that i^2 =-1. i.e 21+28i +7(-1) = 21+28i-7= 14+28i. The complex conjugate of 14+28i is 14-28i.( To find the complex conjugate, we should change the sign of imaginary part) i.e 14+28i becomes 14-28i. Hence the complex conjugate of given question is 14-28i. Hope this helps you.

Answer 2

Answer:

14-28i

Step-by-step explanation:

3(7+7i)+i(7+7i)

=21+21i+7i+7i^2

=7i^2+28i+21

=we know that i^2=-1

=-7+21+28i

=14+28i

for finding complex conjugate ,the imaginary part sign changes to either positive to negative or negative to positive

for example,a+ib changes to a-ib

thereforethe solution for given question is

14-28i

i hope this helps u