I think the answer is 7.28010988
4 - (-3) = 7^2 = 49
2- 4 = -2 ^ -2 = 4
Then we add them and get 53.
Since the number isn't a perfect square we have to use the perfect square of other numbers to find the decimal for this number. We have a square root of 49 is 7. Then we have the square root of 64 is 8. So our number has to be 7. Something.