Question

-10/1-2i simplified

Answer 1

is it
\[ \large \frac{-10}{1-2i} \]

Answer 2

you have to get rid of the imiganary i in denominator by multiplying by its complex conjugate

Answer 3

Multiply and divide with 1+2i

Answer 4

yes @helder_edwin

Answer 5

\[\Large \frac{-10}{1-2i}*\frac{1+2i}{1+2i}\]

Answer 6

well as @timo86m said
\[ \large \frac{-10}{1-2i}\cdot\frac{1+2i}{1+2i}= \]
can u go on

Answer 7

and use that fact that i*i=-1

Answer 8

\[\Large \frac{-10-20i}{(1)^2-(2i)^2}\]

Answer 9

\[\Large \frac{10-20i}{1-4i^2}=\frac{10-20i}{1-(-1)(4)}\]

Answer 10

just add in denominator !!!

Answer 11

@katiebugg did you get it?