HARDEST MATH PROBLEM EVER

[mjer1984]

r=x=4.200744

area= 63.01115

 

[maddness]

4 x 10 to the power of apples v oranges

eat the math

drink the math

sleep with the math

be the math

then and only then you can do the math

 

[Inquisitor]

Simple: find x in terms of r from the equation linking p, x, and r (taking p as constant), then substitute into the equation for A, differentiate with respect to r to maximise A, then plug in your value of p.

 

[Darg]

I don't know how I did it but I got r = 3.2316 giving area of 37.291817.

I'm probably wrong though it's been 5 years since i did my leaving cert maths.

 

[gary996]

Simple: find x in terms of r from the equation linking p, x, and r (taking p as constant), then substitute into the equation for A, differentiate with respect to r to maximise A, then plug in your value of p.

CORRECT

 

[peterattheboro]

Simple: find x in terms of r from the equation linking p, x, and r (taking p as constant), then substitute into the equation for A, differentiate with respect to r to maximise A, then plug in your value of p.

My brain hurts.

 

[mjer1984]

or put the equations in excel and run a solver to vary x and r keeping P equal to 30 whilst maximizing A. After all what were computers made for..

 

[Hxc]

Surely you just create an equation from the area and perimeter equations and then differentiate to get radius which maximises area and then plug in the radius.

Any decent A-level Maths student should be able to do this.

edit: lemme check if youve done it right

edit: I get x = r = 4.2007 which corresponds to A = 63.011

x being equal to r is also intuitive if you are maximising a rectangle.

Yeep. That's what I got too. We learnt this a week or so ago in the first few lessons of AS Level maths.

 

[jaybee]

All I see when I look at "Your work" is a drawing of a ***** at the top

I am immature to have laughed at that? Brings back memories of doodles on school books.

 

[Pilky01]

Maths makes my head hurt

 

[shifty_uk]

Maths makes my head hurt

and my eyes explode.

 

[spp]

I also get A = 63.01 feet squared

 

[Amleto]

This must be a trick question. you say 'hardest math problem ever' but you actually mean... ?

 

[Garp]

This must be a trick question. you say 'hardest math problem ever' but you actually mean... ?

MY KEYBOARD IS STUCK ON ALL CAPS!!!

 

[Nitefly]

4 x 10 to the power of apples v oranges

eat the meth

drink the meth

sleep with the meth

be the meth

then and only then you can do the meth

Worrying ideals there....

 

[SpeedFreak]

x=6.71
r=3.224
area= 6.71*(2*3.224)+3.224^2*pi*0.5=59.59

sorry, messed up the easy bit earlier.

 

[Streeteh]

Simple: find x in terms of r from the equation linking p, x, and r (taking p as constant), then substitute into the equation for A, differentiate with respect to r to maximise A, then plug in your value of p.

You just made my hangover come back, is it bad that i can't even read that in one go let alone understand it?

 

[Squark]

Im guessing it involves rearranging into a formula, differentiation to find turning points, then again to find if it's a MAXIMA/Minima value, plug numbers back in. Ta-dah!

 

[ugatennis08]

I had it right all along, the problem lied in the fact that I completely ignored my end answer and instead decided I did something wrong

After then telling all helpers I had done it wrong they couldn't see the error in my working and were taking my word that the r = 4.2 was incorrect

 

[SpeedFreak]

are you saying that r=x=4.2?