Hi I have a few more doubts!

How do I get from-(±(3-2i))^2 to (3i+2)^2?

I know the-sign in front is i^2, so I multiply it in..but if I multiply i^2 in isn't it (3i^2-2i^3)^2 instead, thus (-3+2i)^2?

Also, is |a-bi| = a+bi?

Thank you so so much!