Invisible numbers. I know the answer is 1-7i but I get lost in the process?

### 2 Answers

lol its not invisible numbers: imaginary numbers;

i is the same thing as sqrt(-1) which obviously is not a real number; thats why its imaginary. Sometimes, its easiest just to think of the i as an x. like you do with normal algebraic equations, combine like terms (3-2) and (i-6i) which gives 1 – 7i.

hope that helped!

let me ask you this

how would you simplify

.. (3 – z) – (2 + 6z)

hint.. subtract like terms

.. 3 and 2

.. -z and 6z