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Calculator at rescue? (Posted on 2020-11-23) Difficulty: 2 of 5
Calculate the value of ((1474+2194+3664)/2)1/2

No Solution Yet Submitted by Danish Ahmed Khan    
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Question Solution, I guess | Comment 2 of 5 |
The expression can be calculated to be 101763.

But, note that 366 = 147 + 219

And the expression sqrt((a^4 + b^4 + (a+b)^4 )/2) can be simplified.
I guess this rescues the calculator from having to work too hard.
(147^4 + 219^4 + 366^4) = 20,711,416,338 which might overflow some calculators, I suppose.

sqrt((a**4 + b**4 + (a+b)**4 )/2)
= sqrt((2a^4 + 4a^3b + 6a^2b^2 + 4ab^3 + 2b^4)/2)
= sqrt((a^4 + 2a^3b + 3a^2b^2 + 2ab^3 + b^4))
= a^2 + ab + b^2

This simplifies the calculation of 101763 in case some intermediate answers cause an overflow error, or a rounding error when taking the square root.

  Posted by Larry on 2020-11-23 11:53:26
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