14 squared = 196, so you're looking for the sqrt of double that, ie 392, which is almost exactly 19.8
104
2 squared plus 2 x 3 = 10, 7 squared plus 7 x 2 = 63, 6 squared plus 6 x 5 = 66,8 squared plus 8 x 4 = 96 so 9 squared plus 9 x 7 = 81 + 63 = 144.
you use A squared plus B squared equals C squared
2.5 + 3.4 Pythagorean Theorem?
C equals the square root of 1000 or 31.622776601683793319988935444327...
104
There is no non-trivial equivalent.
That factors to (x - 2)(x + 7)
pythagoras
89
X = √63
b= 10
b = 14324.80366
16
a=b=3.60555
2 squared plus 2 x 3 = 10, 7 squared plus 7 x 2 = 63, 6 squared plus 6 x 5 = 66,8 squared plus 8 x 4 = 96 so 9 squared plus 9 x 7 = 81 + 63 = 144.
4