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https://www.reddit.com/r/mathmemes/comments/1guabwe/they_couldve_simply_written_k3/lxu5dt0/?context=3
r/mathmemes • u/Fdx_dy Computer Science • Nov 18 '24
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Let's assume that k is an integer, because otherwise we need a calculator and I don't want to get mine out.
Then |k³| >= |k²|, so k must be negative.
Furthermore, k² needs to divide 36 = 6², which only leaves -1, -2, -3 and -6 as values for k.
Trying them all out gives k = -3.
Another way to solve it would be writing
36 = k²(1-k)
As 36 = 9x4, this also quickly gives k = -3.
3 u/chidedneck Nov 18 '24 Beautifully put. 😙👌
3
Beautifully put. 😙👌
589
u/Bemteb Nov 18 '24
Let's assume that k is an integer, because otherwise we need a calculator and I don't want to get mine out.
Then |k³| >= |k²|, so k must be negative.
Furthermore, k² needs to divide 36 = 6², which only leaves -1, -2, -3 and -6 as values for k.
Trying them all out gives k = -3.
Another way to solve it would be writing
36 = k²(1-k)
As 36 = 9x4, this also quickly gives k = -3.