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Any square of a number [k5] can be written as [k(k+1)] appended by 25. So, for 75^2 get 7*8=56, and 75^2=5625. The algebra is quite simple for this instance, unlike the other one, which is usually proved by induction.
Any square of a number [k5] can be written as [k(k+1)] appended by 25. So, for 75^2 get 7*8=56, and 75^2=5625. The algebra is quite simple for this instance, unlike the other one, which is usually proved by induction.
youtu.be/ULtgIBKemlc?...
youtu.be/ULtgIBKemlc?...