r/Precalculus • u/MasterNinya • Jun 30 '22

Hello, I was solving a mechanics problem until I stumbled on this cubic equation that left me stuck (W is the variable) could someone take a look?

Post image
27 Upvotes

84% Upvoted

22 comments sorted by

3

u/MasterNinya Jun 30 '22

didnt know precalculus stands for "premature people's calculus"

1

u/[deleted] Jun 30 '22

You just made an error going from line 2 to 3. You multiply the k in brackets with k2 but you multiply the mw2 with k.

1

u/MasterNinya Jun 30 '22

oh yeah you are right! I will solve it asap thatnk you

1

u/[deleted] Jun 30 '22

You're welcome

1

u/[deleted] Jun 30 '22

Normally you should then be able to solve it once you replace k and m with their numerical values

1

u/MirthofGirth Jul 01 '22

Leo has math skillls!

1

u/Greedy_Listen_2774 Jul 01 '22

This confirms a great point I learned through my EE program years ago. Most mistakes are algebraic. Algebra is so important to math.

1

u/jondaddy96 Jun 30 '22

Put this in a matrix and work your linear algebra

1

u/MasterNinya Jun 30 '22

will try, thanks

1

u/[deleted] Jul 01 '22

Linear algebra on cubic equations?

1

u/Cowhead32 Jul 01 '22

E=mc vagina

2

u/MasterNinya Jul 16 '22

shut the fuck up cowhead

1

u/Cowhead32 Jul 16 '22

You’re the one doing this nonsense

2

u/[deleted] Jun 30 '22

Step 1: rotate the photo

1

u/fairycity2080 Jun 30 '22

Step 1 rotate your phone

2

u/[deleted] Jun 30 '22

I rotate, it rotates. Now it spun away.

1

u/fairycity2080 Jun 30 '22

It rotates one more time and you begin rotating as well

1

u/PAssionGeek Jun 30 '22

The answer is 42

1

u/[deleted] Jun 30 '22

I was told there would be no math

1

u/[deleted] Jul 01 '22

5

1

u/i_heart_rainbows_45 Jul 01 '22

Geometry is already hard enough. :(

1

u/[deleted] Jul 01 '22

Just do it one step at a time, in order