October 3, 2010 | 
Author The concept of DUPLEX has to be learned before you learn SQUARING ANY NUMBER USING DUPLEX METHOD.
When can I use this method?
For squaring any number.
Notes –
- Notice the patterns in which the digits are selected.
- Notice the way the individual values are added.
- This method uses the concept of (a + b +c +…)2 = a2 + b2 + c2 + … 2ab + 2bc + 2ac + … (It is a simplified version of the Multinomial Theorem)
Related Shortcuts –
Squaring Any Number using Duplex Method
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Posted in (Sq) Dupldx, Speed Math, Squaring and Square Roots | 
Tags: Math Tricks, Mental Math, Speed Math, Squaring and Square Roots
Share your thoughts
Best I can tell for 5 digits you list 2(a x e) + 2(b x d) + e^2
but you mean for the last term to be + c^2
as that is what you do with the actual numbers.
Yes, you are right. the e^2 should really be c^2.
We will fix the video.
Thanks for pointing out the error.