# How do you subtract (-9+61)-(3+i)?

I suspect that your first bracket should be: $\left(- 9 + 6 i\right)$
$\left(- 9 + 6 i\right) - \left(3 + i\right) =$
$- 9 + 6 i - 3 - i =$ you add together (respecting the sign) the real and the immaginary:
$\left(- 9 - 3\right) + i \left(6 - 1\right) = - 12 + 5 i$