Question

add
${x}^{2} + 3xy - yz \: . {y}^{2} + 3yz \: - zx \: and \: {z}^{2} + 3zx \: - xy$
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Answer 1

Answer:

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Step-by-step explanation:

x²+3xy-yz+y²+3yz-zx+z²+3zx-xy

= x²+3xy-xy-yz+3yz+y²-zx+3zx+z²

= x²+2xy+2yz+y²+2zx+z²