MathMania

spyrothepalmontcityracer · Mar 15, 2015 3:43 PM

So, how about a math game, calculators be prepared.

i'll start with multiplication

7 X 5

NeoReaper · Mar 15, 2015 5:51 PM

35.
π =?

Last edited by NeoReaper (Mar 15, 2015 5:52 PM)

spyrothepalmontcityracer · Mar 15, 2015 6:02 PM

3.14159265

convert 50.00USD into British Pounds.

Gekoncze · Mar 15, 2015 6:59 PM

33.9

Let x € R, y = x^2 + 3x + 5
y' = ?

spyrothepalmontcityracer · Mar 29, 2015 12:20 AM

Wow Gekoncze, that one's hard!

Gekoncze · Mar 29, 2015 11:04 AM

Nobody wants to solve it sad

Scaler · Mar 29, 2015 12:44 PM

€R, as in the hospital.

I'm not that far in math yet, buddy.

Paranoia · Mar 29, 2015 5:18 PM

It's been a while since I've had a Calculus class, but I think this is right:

y'=2x+3

Seems like a simple derivative? Now if you had one with the chain or power rule I probably wouldn't remember how to solve it. Not sure what Let x € R means though so I could be completely wrong.

A large box rests on an icy surface. Someone pulls on the box with a Force = 10 N at a angle 37 degrees above the horizontal. If there is no friction between the box and ice, what is the change in the box's kinetic energy after moving 5 meters? (I found my old physics notebook in my room tongue )

Sheep · Mar 29, 2015 7:09 PM

Last edited by Sheep (Mar 29, 2015 7:14 PM)

Gekoncze · Mar 29, 2015 7:12 PM

*got ninjad*

Last edited by Gekoncze (Mar 29, 2015 7:14 PM)

Paranoia · Mar 29, 2015 8:00 PM

Sheep · Mar 30, 2015 10:56 AM

106.9 cm seems right to me smile

Now lets do one with imaginary numbers!

'i' is an imaginary unit defined by it's property i^2 = -1.

imaginary number = real number * i.
Example: 2i

complex number = real number + imaginary number.
Example: 5 + 2i

So for example, we have the imaginary number 4i.
It is multiplied with a real number like this:
3 * 4i = 12i
And with an imaginary number, like this:
2i * 4i
= 2*4*(i*i)
= 8*(i^2)
= 8*(-1)
= -8

Now, multiply the complex number (1 + 2i) with the imaginary number 3i.

(1 + 2i) * (3i) = ?

Last edited by Sheep (Mar 30, 2015 10:58 AM)

#1 Mar 15, 2015 3:43 PM

MathMania

#2 Mar 15, 2015 5:51 PM

Re: MathMania

#3 Mar 15, 2015 6:02 PM

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#4 Mar 15, 2015 6:59 PM

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#5 Mar 29, 2015 12:20 AM

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#6 Mar 29, 2015 11:04 AM

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#7 Mar 29, 2015 12:44 PM

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#8 Mar 29, 2015 5:18 PM

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#9 Mar 29, 2015 7:09 PM

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#10 Mar 29, 2015 7:12 PM

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#11 Mar 29, 2015 8:00 PM

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#12 Mar 30, 2015 10:56 AM

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