Question

Please help with 29. Perform the indicated operation and express result as a simplified complex number

Answer 1

29. (3+4i)(3-4i)

We can operate and we have this:

`3\cdot3-3\cdot4i+3\cdot4i+(4i)(-4i)`

Solving we got:

`9-12i+12i-16i^2`

We also know that:

`i^2=-1`

Then we have:

`9-16(-1)=9+16=25`

Then the final answer is 25