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Problema algebra!!!!!!!!!!!

Problema Algebra class=

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Rhrhask
f(1+x,1+y)=[(1+x)(1+y)]^2-(1+x)^2(1+y)^2
=(1+x)^2(1+y)^2-(1+x)^2(1+y)^2
=0
f(1+x,y)= [(1+x)y]^2-(1+x)^2y^2
=(y+xy)^2-(1+2x+x^2)y^2
=y^2+2xy^2+(xy)^2-y^2-2xy^2-(xy)^2
=0
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