Question

Multiply
(5-3i)(6+4i)
I'm still stuck on how to work this. i= sqrt -1
so...
(5-3(sqrt-1)(6+4(sqrt-1))

Answer 1

i don't recommend replacing i with sqrt(-1) ....it just gets messy
leave it in terms of "i" but whenever you get i^2 , replace it with -1

Answer 2

\[(5-3i)(6+4i)\]\[=(5\times6)+(-3i\times6)+(5\times4i)+(-3i\times4i)\]

Answer 3

\[=(5\times6)+(-3\times6+5\times4)i+(-3\times4)i^2\]
\[=(5\times6+3\times4)+(-3\times6+5\times4)i\]

Answer 4

This is our Typical @UnkleRhaukus ..