Posted by Tristan on Monday, June 9, 2008 at 9:41pm.
a^2 - b^2 = (a+b)(a-b)
here we have
a = sqrt 5
b = 5 sqrt 6
a^2 = 5
b^2 = 25*6 = 150
5 - 150 = -145
so yes
ty Sir
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