x ^ { 2 } + 18 x y + z ^ { 2 } - 7 \text { to get } x ^ { 2 } + 10 x y – InterviewSolution

1.	x ^ { 2 } + 18 x y + z ^ { 2 } - 7 \text { to get } x ^ { 2 } + 10 x y - 2 z ^ { 2 } + 1 ?
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