x^2 = xy

x^2 - xy = 0

x ( x - y ) = 0

Therefore, for the equation to hold, X HAS to = 0

Y could be anything. Y does not have to be 0. Say Y = 0 but X = 5, then the expression does not equal to 0. say X = -Y and X = 5 then Y = -5. Plug it in the formula to get 5 ( 5 - (-5) ) = 5*10 = 50 and not equal to 0. True that Y = to 0 ONLY IF X is. However, the expression will NOT give you 0 in all scenarios if only Y = 0.

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Best Regards,

Paul