Add:a)3x²+2xyz+4zx and 2x²+6xyz-2zx b)3x²-2xy+9 , 4x²+6xy-3 , 5x²+11xy+3
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(a)
3x² + 2xyz + 4zx
2x² + 6xyz - 2zx
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5x² + 8xyz + 2zx
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(b)
3x² - 2xy + 9
4x² + 6xy - 3
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7x² + 4xy + 6
5x² + 11xy + 3
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12x² + 15xy + 9
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