(5√2)^2-(6√2)^2=(25*2)-(36*2)=50-72=-22
(√17)^2-(√11)^2=17-11=6
(2√x)^2-(5√y)^2=4x-25y
(√6-2)^2=6-4=2
(9*7)-(4*3)=63-12=51
(5√2)^2-(6√2)^2=(25*2)-(36*2)=50-72=-22
(√17)^2-(√11)^2=17-11=6
(2√x)^2-(5√y)^2=4x-25y
(√6-2)^2=6-4=2
(9*7)-(4*3)=63-12=51