x2 - 81y2 = (x + 9y) (x - 9y)
The actual numerical value depends on the values of 'x' and 'y'.
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2x2=4 x2=8 x2=16 x2 = 32 and 5x5 = 25 so no, I guess not.
x = x, y=y, x2=x2
x2=6*150 x2=900 x=30
2x2=4 X -2=-8
It has two equal roots which are 3