Question

Express in terms of i: (
-12
) − (
-3
)

Answer 1

(-12) + 1(-3)
-12 + -1(-3)

Multiply⇒ -1 × -3
-12 + 3

Then combine all the like terms ⇒ -12 + 3

And, finally you're left with -9

So, -9 is your answer