Review Suggested Edit

You can't approve or reject suggested edits because you haven't yet earned the Edit Posts ability.

Multiply complex numbers.

Multiply complex numbers. 2 space-seperated ones will be input,
as follows:
`a+bi`
`-a+bi`
`a-bi`
`-a-bi`
where a and b are integers written in base 10.
You are expected to output in the same format.
~~For those unfamiliar: i is the imaginary constant, the value of sqrt(-1), and a complex number is the sum of a real number and an imaginary number.~~
Shortest code following the rules wins.
EDIT: test cases:
- `3+4i 4-5i` -> `8-31i`
- `-4+9i 2-2i` -> `10+26i`
- `-4+9i 2+2i` -> `-26+10i`
- `-3+0i 10+0i` -> `-30+0i`
- `0+1i 0+1i` -> `-1+0i`

Multiply complex numbers. 2 space-seperated ones will be input,
as follows:
`a+bi`
`-a+bi`
`a-bi`
`-a-bi`
where a and b are integers written in base 10.
You are expected to output in the same format.
For those unfamiliar: \$i\$ is the imaginary constant, the value of \$\sqrt{-1}\$, and a complex number is the sum of a real number and an imaginary number.
Shortest code following the rules wins.
EDIT: test cases:
- `3+4i 4-5i` -> `8-31i`
- `-4+9i 2-2i` -> `10+26i`
- `-4+9i 2+2i` -> `-26+10i`
- `-3+0i 10+0i` -> `-30+0i`
- `0+1i 0+1i` -> `-1+0i`

code-golf math