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Question #0ff75

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May 13, 2017

#x^2+y^2+xy#

#=x^2+y^2+2xy-xy#

#=(x+y)^2-xy#

#=((sqrt2+1)/(sqrt2-1)+(sqrt2-1)/(sqrt2+1))^2-(sqrt2+1)/(sqrt2-1)xx(sqrt2-1)/(sqrt2+1)#

#=(((sqrt2+1)^2+(sqrt2-1)^2)/(2-1))^2-1#

#=((2(2+1))/(2-1))^2-1=6^2-1=35#

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