Question

Find the product of the complex number and its conjugate.
1 + 3i

Answer : 1 - 9i correct??

Answer 1

multipy that and 1-3i

Answer 2

so yu will get 10

Answer 3

was gonna say that :P

Answer 4

whatever katie... lies.

Answer 5

thank you

Answer 6

welcome. anytime.

Answer 7

i was typyin was i not :P

Answer 8

In general

(a+b)(a-b) = a^2-b^2

So

(1+3i)(1-3i)

1^2 - (3i)^2

1 - 9i^2

1 - 9(-1)

1+9

10

which means

(1+3i)(1-3i) = 10

Answer 9

thanks @jim_thompson5910

Answer 10

you're welcome