Question

K =

√2abc
1 + a²-b(squared)+c² - 5b
If a = 4, b = -2 and c = -1
evaluate K
K=

Answer 1

I’m not sure I fully understand your question but substituting the numbers into the equation you’ve given I’ve got this:
1+4^2- -2^2+ -1^2 - (5X-2)

1 + 16 - 4 + 1 - -10 =24

And then back to the question:

If the square root of 2 X abc

Abc = 4 X -2 X -1 =8
2 X 8= 16
Square root of 16= 4

OR!

2 X 24 (which we got using the equation earlier ) = 48
Square root of 48 = 6.92820323028

So K is either 6.92820323028 or 4 ??