If a figure has eight vertices and 12 edges, how many faces does it have

Question

anonymous · Answer

$$\text{Euler's Formula} = F + V = E + 2$$

anonymous · Answer

V = 8
E = 12
Plug them in and solve for F.

anonymous · Answer

Do you have a good website that shows how we can derive it?
@Calcmathlete

anonymous · Answer

Um no? I just learned it...sorry :/

anonymous · Answer

i dont get it

anonymous · Answer

$$F+V=E+2$$
$$V=8$$
$$E=12$$
$$F=?$$

Just plug in what V and E are and solve for F

anonymous · Answer

do u  get it now?

anonymous · Answer

F + 8 = 12 + 2
Can you solve it now?

anonymous · Answer

Do you know how to add?

anonymous · Answer

Like 1+3=?

Can you do that or no?

unklerhaukus · Answer

cube?

anonymous · Answer

@romero yeah

anonymous · Answer

Then plug in the numbers you are given and add and subtract accordingly

anonymous · Answer

to find what F is

anonymous · Answer

F is your answer

unklerhaukus · Answer

@Calcmathlete where does
 Euler's formula $F+V=E+2$ come from/
|dw:1341383361008:dw|

anonymous · Answer

@UnkleRhaukus Were you answering Romero's question? I'm confused :/

unklerhaukus · Answer

ah i diden't realize someone had already asked where it cam from, and you have already answered them

shane_b · Answer

It's Euler's polyhedron formula...

unklerhaukus · Answer

what happens if we try to apply this formula to a  sphere/

unklerhaukus · Answer

$$F+V=E+2$$
F=1
V=0
E=-1?

unklerhaukus · Answer

perhaps 
F≠1
V≠0

anonymous · Answer

Well, This is Euler's Polyhedron Formula. A sphere is not a polyhedron.