10 1 points a The complex conjugate of 1 8 is 1 8 b 8 8 Solu

10. -1 points (a) The complex conjugate of 1 +8/ is 1 +8 (b) 8 +8)

Solution

12 ) just open the brackets

6-5i -5-6i = 1-11i

10)

The complex conjugate of 1+8i is obtianed by changing the sign of 8i to - , thus answer is 1-8i

b)

(1+8i)(1-8i) is of the form on (a^2-b^2) = (a+b)(a-b)

1-(8i^2) , also i^2 = -1

so

1-64*(-1) = 65