Mathmatical Logic Fails Me

[Megacherv]

Spoiler: all I know about Math

I was never good at math, mainly because we had kick ass calculators, but still.

I would attempt to solve it but it seems that it has already been done.

I'd like to contact the person that drew that and ask him how he knows that a=1, as (a+b)(a-b)= infinite, as will b(a-b)...wow...trailed off there...

Just to clarify, what's the rule for 0/0? Is it 0 or infinite?

 

[Silver Scribbler]

snip

What the hell are you on about? That makes no sense. We want all of them to equal 0.

Sorry, I thought this was a lot more basic than it is. Only really took in the bit that I quoted.

Basically, ignore me completely.

 

[MaskedMori]

I'm not a math "wiz", but the only problem I really had with algebra was when I got an equation that was purposly made impossible. I really hated those because they ALWAYS caught me off guard.

 

[Thaius]

About time someone else figured this out: math is not logical.

At its base level, of course: math is concrete, absolute, and logical. But then you get into some of the more complex stuff. All the sudden math is no longer about, "Let's figure out how this works," it's about, "this turns out one way, but I want it to be different, so let's see how we can change it." It's all bull, really.

 

[MystikMtnManaT]

The determinant of the matrix equation is zero. Thus there is no solution.

This is what my IB friends tell me to be true.. I never learned none of that crazy diddly-doo in AP...

 

[Crystal Cuckoo]

A) 2x-4y-z=10
B) 4x-8y-2z=16
C) 3x+y+z=12

I have trouble with A) and B) namely because, like everyone else on this thread, it can't work.

From A), 2x-4y-z=10

so logically, we can say that

2(2x-4y-z)=2(10)

4x-8y-2z=20

But from B): 4x-8y-2z=16

16=/=20, so the set of equations must be faulty, yes?

 

[crape]

you all are going through such complicated logistics when the answer for the above equations are 'no solution' i'm in advanced math placement i'm in 11th grade and i did this in... mmmm.. 9th there was a nice website that a teacher showed me to help but she was unsure of the validity but here it is http://www.analyzemath.com/Calculators/Calculator_syst_eq.html scroll down and use the second system of equations calculator it showed produce the answer 'No Solution' there you have it

 

[The Lost Big Boss]

THE NUMNBERS THEY HURT MY BRAIN!!!! *Brain Explodes*

 

[GoldenCondor]

Dude, just check with matrices.

 

[Danzaivar]

About time someone else figured this out: math is not logical.

At its base level, of course: math is concrete, absolute, and logical. But then you get into some of the more complex stuff. All the sudden math is no longer about, "Let's figure out how this works," it's about, "this turns out one way, but I want it to be different, so let's see how we can change it." It's all bull, really.

Well no, both ways would be an identical algorithm, but one might be more efficient than the other. It's pure logic.

The reason it doesn't seem logical to us? Our brains ain't pure logic.

 

[hippo24]

2+2=5

[HEADING=1]PROVE ME WRONG[/HEADING]

 

[Mercsenary]

Today for home work I was assigned a few extremely hard problems, One of these was:

Solve Each System Of Equations

2x-4y-z=10
4x-8y-2z=16
3x+y+z=12

____________________________________________


If I'm not mistaken it is logically impossible, as 2x-4y-z=10 multiplied by -2 is -4x+8y+2z=-20.

Now let's do some elimination.
-4x+8y+2z=-20
4x-8y-2z=16
______________
0=-4

(I'm sure -4 does not equal 0)

Thoughts and or help would be nice.

system of equations?

Arent you supposed to have one central equation and the variables are the other equations like:
2x-4y-z =10
y =( -16 +2z -4x )/8
z = 12 - 3x -y

Plug those back into the first and solve.


@hippo: (2+2 = 5 ) --> 1 + 1 + 1 + 1 =/= 5

 

[Energylegzz]

0_0 I can barely do math and you people seem like youve been doing since being in the womb....

 

[King of the N00bs]

Today for home work I was assigned a few extremely hard problems, One of these was:

Solve Each System Of Equations

2x-4y-z=10
4x-8y-2z=16
3x+y+z=12

____________________________________________


If I'm not mistaken it is logically impossible, as 2x-4y-z=10 multiplied by -2 is -4x+8y+2z=-20.

Now let's do some elimination.
-4x+8y+2z=-20
4x-8y-2z=16
______________
0=-4

(I'm sure -4 does not equal 0)

Thoughts and or help would be nice.

if you get 0=-4 then simply label it as "impossible" since zero will never be equal to negative four.

 

[Lukeje]

Just to clarify, what's the rule for 0/0? Is it 0 or infinite?

Neither and both. 0/0 = NaN, i.e. "Not a Number".

 

[Bofore13]

That just means hat there is no common point in those 3 planes in a 3-d graph so at least 2 of them are parallel.