Question

How do you simplify `(2 + 6i) - (7+9i)`?

Answer 1

`-5-3i`

Explanation:

You simply need to sum the real part and the imaginary part: if you write the real part in blue and the real part in green, you get

`color(blue)(2) + color(green)(6i) - (color(blue)(7) + color(green)(9i)) = color(blue)(2)-color(blue)(7) + color(green)(6i)-color(green)(9i) = color(blue)(-5)+color(green)((6-9)i)=color(blue)(-5)color(green)(-3i)`