$$a=2; b=3; c=1; a^{2}-b^{2}+c^{2}$$
$d=-4$
$$d=2^{2}-3^{2}+1^{2}$$
$$d=4-3^{2}+1^{2}$$
$$d=4-9+1^{2}$$
$$d=-5+1^{2}$$
$$d=-5+1$$
$$d=-4$$
$$a=2$$ $$b=3$$ $$c=1$$ $$d=-4$$
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