Colin the Mathmo on Nostr: I don't know what 55² is, and I wouldn't bother to compute it by hand. But I do ...
I don't know what 55² is, and I wouldn't bother to compute it by hand.
But I do know:
a²-b² = (a-b)(a+b)
a² = (a-b)(a+b)+b²
Setting a=55 and b=5 we get
55² = (55-5)(55+5) + 5²
Suddenly it's obvious, not because of the numbers, but because of the structure.
The facility with numbers is an epiphenomenon.
2/n, n=2
Published at
2024-09-09 13:16:50Event JSON
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