show the eqn x2+4y2+4z2+4xy+8yz+4zx-9x-18y-18z+18=0 represents a pair of parallel lines. find the distance between them ?​

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show the eqn x2+4y2+4z2+4xy+8yz+4zx-9x-18y-18z+18=0 represents a pair of parallel lines. find the distance between them ?​

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Everleigh 3 weeks 2021-09-07T04:38:16+00:00 1 Answer 0 views 0

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18:9+8+9*3-7:3-1*13 = ? ( )