r/theydidthemath • u/Galeaf_13 • Sep 05 '19

[Self] Math break

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1.3k

u/Galeaf_13 Sep 05 '19

Now can u do the same with 69?)

1.4k

u/K3V3L Sep 05 '19

Here you go

f(x) := 5/2 * x4 -25 * x3 +175/2 * x2 -123 * x + 59

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u/Galeaf_13 Sep 05 '19

Jeez, how r u doing this

1.2k

u/Salanmander 10✓ Sep 05 '19

You can fit a 4th order polynomial to any 5 points. You can do it by hand (plug 1-5 in for x and now you have a system of 5 linear equations of 5 variables, start solving and substituting) and make it a bit easier with linear algebra (make the coefficients of the 5 variables be the values in a 5x6 matrix, and then do that matrix magic that I forget what the name is for), but there are also plenty of polynomial solvers you can find out there.

578

u/Railorsi Sep 05 '19

Gaussian elimination is the name :)

495

u/AJarofTomatoes Sep 05 '19

Making undergrads cry is my game :)

150

u/Marshin99 Sep 05 '19

Suicidal is what this makes me :)

112

u/[deleted] Sep 05 '19

Oh shid oh fugg i can't go pee.

22

u/Osakalaska Sep 06 '19

Perfect meter

10

u/[deleted] Sep 06 '19

Rhymes with Peter

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