Is my answer right? :)

Multiply (8 + 3i)(3 + 5i)

MY ANSWER: 24 + 49i + 15i2

Question

Is my answer right? :)

Multiply (8 + 3i)(3 + 5i)

MY ANSWER: 24 + 49i + 15i2

anonymous · Answer

24 + 40i + 9i + 15i^2
24 + 49i -15
9 + 49i


You are really close, the only thing you forgot is that i = the square root of -1, so when you multiply i^2, you are multiplying by -1, so that 15i^2 turns into -15. (:

anonymous · Answer

wow, thank you so much! I appreciate it :)

anonymous · Answer

wait....No....

anonymous · Answer

?

anonymous · Answer

It wouldn't be a negative

anonymous · Answer

$$i=\sqrt{-1}$$$$i^2=-1$$

anonymous · Answer

$$i = \sqrt{-1}, \therefore i ^{2} = -1$$

anonymous · Answer

Oh lol yes @ChmE just said that

anonymous · Answer

hmmm.. I think there may be a mistake on my professor's end...

anonymous · Answer

I can assure you, @thechocoluver445 is correct

anonymous · Answer

Possible options:
		
39 + 49i
		
9 + 49i
		
24 + 15i2
		
24 + 49i + 15i2

anonymous · Answer

Then it is the second choice.

anonymous · Answer

:/

anonymous · Answer

it would be D if it was a negative

anonymous · Answer

But D isn't fully simplified, and if it is asking to simplify, then it is an incomplete answer. It has to be B because that is the most simplified

anonymous · Answer

@thechocoluver445 is correct

anonymous · Answer

Which is what she posted in her first post

anonymous · Answer

If you want more guidance @InsanelyChaotic, I recommend watching https://www.youtube.com/watch?feature=player_embedded&v=ysVcAYo7UPI He's really helpful.

anonymous · Answer

Thanks @ChmE

anonymous · Answer

Thank you, very much appreciated @thechocoluver445