Simplify
(-3i)(-4i)

Question

Simplify
(-3i)(-4i)

anonymous · Answer

Okay its -12

anonymous · Answer

without an i?

solomonzelman · Answer

$$i \times i=i^2=-1$$

you question can be re-written as:
$$(-1) \times 3 \times i \times (-1) \times 4 \times i$$

Put it in a different order to see it better.
$$(-1) \times (-1) \times 3 \times 4  \times i \times i$$

preform the multiplication, @summerd

anonymous · Answer

I think the only thing that may be hard about this problem is the i. Just remember that $$i=\sqrt{-1}$$
$$\therefore i^{2}=\sqrt{-1}*\sqrt{-1}=-1$$

anonymous · Answer

12 but i dont know what to do with teh i

solomonzelman · Answer

@summerd do you know what i stands for? what is i= to?

anonymous · Answer

1????

solomonzelman · Answer

Noooo!

anonymous · Answer

refer to post above @_@lll

solomonzelman · Answer

You are not prepared enough to answer this problem, your math level is TOO LOW, if you don't know what an i is, can't help you, sorry.

anonymous · Answer

@collegekids are you sure just 12 is the answer

anonymous · Answer

yeah, -12 is the answer

solomonzelman · Answer

Nooo! @collegekid, you are not a college kid, if you don't know that it is NOT -12.

solomonzelman · Answer

i^2=-1 and there are 2 negatives in a mutliplication

anonymous · Answer

i know the answer is not negative

anonymous · Answer

Okay I got -12 because i*i=-1

anonymous · Answer

-3*-4=12*-1=-12

solomonzelman · Answer

My bad, sory

anonymous · Answer

Its okay

solomonzelman · Answer

I thought there are 2 minuses, bu there are 3.

solomonzelman · Answer

@collegekids  sorry.

anonymous · Answer

Oh i see, yeah its kind of confusing

anonymous · Answer

so @collegekids was right??

solomonzelman · Answer

yes, but you wouldn't know how to do it, would you?

anonymous · Answer

@SolomonZelman me?

solomonzelman · Answer

No, collegekids, of course not you, I see you know this staff well. I was talking to summerd

anonymous · Answer

I appreciate your kind words @SolomonZelman, I have a problem of my own that Im trying to solve lol

anonymous · Answer

Solomon just wants you to understand the concept. He believes that just looking at the solution and barely understanding the process in which it was solved is a complete waste of time. If you want to ace your test or whatever you need this knowledge for, you should understand the process in which the answer is derived or you will always be a failure.

anonymous · Answer

The end was a bit strong, sorry.