G Gabrielle New member Joined Sep 14, 2011 Messages 2 Sep 14, 2011 #1 I need to prove this proof incorrect, but I don't know how, please help. Let x=y Xy=x^2 xy-y^2=x^2-y^2 y(x-y)=(x+y)(x-y) Y=x+y Let x=1 y=1 1=1+1 1=2
I need to prove this proof incorrect, but I don't know how, please help. Let x=y Xy=x^2 xy-y^2=x^2-y^2 y(x-y)=(x+y)(x-y) Y=x+y Let x=1 y=1 1=1+1 1=2
burakaltr Junior Member Joined Aug 26, 2011 Messages 126 Sep 14, 2011 #2 Gabrielle said: I need to prove this proof incorrect, but I don't know how, please help. Let x=y Xy=x^2 xy-y^2=x^2-y^2 y(x-y)=(x+y)(x-y) Y=x+y Let x=1 y=1 1=1+1 1=2 Click to expand... (x-y) division is division by ZERO, that's why your proof fails because division by zero is undetermined in math.
Gabrielle said: I need to prove this proof incorrect, but I don't know how, please help. Let x=y Xy=x^2 xy-y^2=x^2-y^2 y(x-y)=(x+y)(x-y) Y=x+y Let x=1 y=1 1=1+1 1=2 Click to expand... (x-y) division is division by ZERO, that's why your proof fails because division by zero is undetermined in math.
