Can someone explain me why the following function is non-linear?
$y = 2x_1^2 + 8x_2^2 + 4x_1x_2 + 8x_2 + 9x_1$
due to the two terms $2x_1^2, 8x_2^2$ or due to the $4x_1x_2$ term?
and if I want to transform to linear with transformation I can?
2026-04-02 15:20:15.1775143215
Transform non-linear to linear function
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