Question

will medal for answer

Simplify (6 + i)(8 − 3i).

51 − 10i

48 − 3i2

45 − 10i

48 − 10i − 3i2

Answer 1

I know its between b and d I'm pretty sure

Answer 2

@3mar

Answer 3

It is the first choice.
Let me show you

Answer 4

(6+i)(8-3i)
=48-18i+8i-3i^2
=48-10i+3
=51-10i


Hope that helps

Answer 5

@mikey

Answer 6

howd the 3i turn into a 3

Answer 7

@3mar

Answer 8

because u squared it?

Answer 9

\[(6+i)(8-3i)=48-18i+8i-3i^2=48-10i-3i^2\]
and of course you know that \[i^2=-1\]
because
\[i=\sqrt{-1}\]

Good?

Answer 10

so\[3i^2=3(-1)=-3\]
and proceed

Answer 11

good explanation

Answer 12

Thank you for the medal!

Answer 13

np

Answer 14

Good learner!
I really like who ask and stop the explanation when he sticks to something, even it looks like so simple