Talk:759: 3x9

Explain xkcd: It's 'cause you're dumb.
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In the middle of a Physics I exam, I forgot one of the equations of motion. Using my basic working knowledge of Calculus and the relationship between acceleration, velocity, and position, I managed to derive an equation which I used to solve the problem. When I got my exam back, I was given only partial credit because I got the right answer using the wrong formula.Smperron (talk)

Ah, [insert your nation here]'s educational system at work. ImVeryAngryItsNotButter (talk) (please sign your comments with ~~~~)
I did something like this last year when we had to calculate how long it would take for something to fall ... meters on the moon, making a graph with y=v and x=t and making an integral by rewriting v to ...t^2, and then solving for the ... meters. My teacher gave me one point less for not using the correct formula but 2 bonus points for taking thinking about this solution. He is great. 13:37 UTC(I think) 8 octobre 2016
Or perhaps re-estimate the value of making the cubed root of 81 look like 27 when the marker knows it is really 4.32674871092 and a bit. I used Google News BEFORE it was clickbait (talk)
Uh, no, xth root is written as superscript....? Or am I missing the joke. 19:54, 31 October 2015 (UTC)

I had an old math teacher once who didn't spend too much effort in grading trickier problems, so I got away with something similar in deriving Lagrange's Trig Identity in a complex class. Maybe 8 steps from the LHS and 2 steps from the RHS were right, and the equals sign that joined them was a leap of faith. --Quicksilver (talk) 01:55, 20 August 2013 (UTC)

This is particularly useful when Wolfram|Alpha tells you the answer, but you don't know how to get the answer, and you can't afford Pro. MonacleforSauron (talk) 23:58, 1 August 2016 (UTC)

Some browsers seem not to support formulas without add-ons etc. I added the formula also in simple characters. (talk) (please sign your comments with ~~~~)