(�ã5 + 5�ã6)(�ã5 - 5�ã6)

Question

is the answer -145 ???

Answer 1

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

Answer 2

ty Sir