This caught my eye on a whiteboard near a math professor’s office yesterday: A(x-1) + B(x+2) = x

I was busy, running around setting up a projector which was missing a cord (and still is) for my seminar class. This equation (with 3 unknowns) took up temporary storage space in my head and rattled around in there. Spoke to me. Made me wonder what it modeled. Made me want to find a pencil and solve for x.

Think about the distractions in a ~~normal~~ typical person’s life, those that entice a human, the most intelligent life form in our world, to stray from a task. Things like Twitter, Facebook, video games, playing with a smartphone, snacks.

So I’m wondering whether maybe I’m the last living person who is distracted by math, and puzzles, and the teasing potential enjoyment of wracking my brain. Am I the sole survivor or are there billions like me out there, but the rest of you are too cool to admit it?

After seminar, I saw the pesky equation-with-3-unknowns again, just waiting and taunting me as I passed by, so I stored it in my head and carried it to my office and solved for x on my whiteboard. It was a simple exercise of the mind and it was fun, like solving stoichiometry problems, calculating formal charge, writing a novel, or designing multistep synthetic schemes.

Upon solving for x, I got x = [A-2B]/[A+B-1], smiled, ate some grapes and tried to get back to my never ending list.

(Go ahead and check me. If you read this far, you know you want to.)

But what does it mean? What does it model? In a quick chart, I input values of A and B and calculated x. No obvious pattern emerged. (I even spent a few minutes exploring in spreadsheet world.) I’d satisfied the itch of solving for x, but I think it might not have a significance–maybe the brilliant math professor just made it up as he walked by the board. If you subtract twice B from A, and then divide by 1 less than the sum of A and B, you’ll get x, every time, no matter the values of A and B–positive, negative, real, or imaginary.

I doubt dogs or dolphins understand numbers, but I’m not sure and that’s not my main concern. My worry? (I hope I’m way off here.) There might be 5 or 6 **billion** humans *who have the intellectual capacity* to think and learn and stretch their brains but they don’t. They don’t want to. Or they think they can’t. But they’re wrong.

Maybe other mammals can’t (yet). But humans can.

So you don’t spend the day worrying, here’s a distraction: y/x = (x+y)/y if x = 1, what is y? (and why is y special?)

For my past organic students, give this one a whirl: Design a synthesis of acetone from ethane. (You know you want to.)

OK. Enough of my oozing geekiness for one morning. Carry on.

I like numbers. But not like YOU like numbers.

I prefer letters and words to numbers and equations. My brain is an anagram machine.

But much like my body, my mind is getting older and stiffer and doesn’t glide through the world as it once did.

Linda

Dear A.M.

Exercise oils up the body and the brain.

Love you!

Dear Mom,

I am so your daughter. Thank you for teaching me to love math. Thank you for that time the summer before sixth grade when you taught me how to solve for x while we were taking a walk. Beautiful stuff!!

I love you!

Kate

Oh, sweet memories…what an odd mother you have. 😀

XOXO

Terry loved this blog. He really “got it”. I think he wanted mW to reply doe him with: ah… She knows there is no answer. But don’t hold mW to that because he said it longer than two minutes ago. He smiled through the whole piece, though. Wish we were closer so the geeks could play together. :-\

Sent from my Verizon Wireless 4G LTE DROID

lauralanni wrote:

> a:hover { color: red; } a { text-decoration: none; color: #0088cc; } a.primaryactionlink:link, a.primaryactionlink:visited { background-color: #2585B2; color: #fff; } a.primaryactionlink:hover, a.primaryactionlink:active { background-color: #11729E !important; color: #fff !important; } /* @media only screen and (max-device-width: 480px) { .post { min-width: 700px !important; } } */ WordPress.com lauralanni posted: “This caught my eye on a whiteboard near a math professor’s office yesterday: A(x-1) + B(x+2) = x I was busy, running around setting up a projector which was missing a cord (and still is) for my seminar class. This equation (with 3 unknowns) took up tem”

doe mW, what?

Thanks Laura, now I am trying to figure out how to solve the general equation y(y-x)= x**2.

You’re welcome Pete!

Read slower. Find y when x = 1.

Easy as chocolate cream pie (with a quatratic formula crust). Yum.

🙂