Let a and b be rational numbers and suppose that (a-b)=4 and a*b=1 . Show that (a+b)^2 = 20.
siriusmart 1 point a year ago
of course the website has something to do with lean
glowing_hans 2 points a year ago
yeah I found this website quite interesting even if I dont want to learn lean right now you can learn some cool proofs. Do you mind if I post other questions from that one here?
dailymaths
@lemmy.world
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dailymaths
@lemmy.world
264
40
1
Share your cool maths problems.
Complete a challenge:
- Post your solution in comments, if it is exactly the same as OP's solution, let us know.
- Have fun.
Post a challenge:
- Doesn't have to be original, as long as it is not a duplicate.
- Challenges not riddles, if the post is longer than 3 paragraphs, reconsider yourself.
- Optionally include solution in comments, let it be clear this is not a homework help forums.
- Tag [unsolved] if you don't have a solution yet.
- Please include images, if your question includes complex symbols, attach a render of the maths.
Feel free to contribute to a series by DMing the OP, or start your own challenge series.
go to feed...
hint
Use algebraic substitution and the binomial formulas
Solution
save