$$(3x+y-z)(3x+y+z)$$
$\left(3x+y\right)^{2}-z^{2}$
$$9x^{2}+3xy+3xz+3yx+y^{2}+yz-3zx-zy-z^{2}$$
$$9x^{2}+6xy+3xz+y^{2}+yz-3zx-zy-z^{2}$$
$$9x^{2}+6xy+y^{2}+yz-zy-z^{2}$$
$$9x^{2}+6xy+y^{2}-z^{2}$$
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$9x^{2}+6xy+y^{2}-z^{2}$
