Quadratic Form Q: Matrix A & Lambda Calculation

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Let Q: R3 \rightarrow R be the quadratic form given by
Q(x) = 2x1x2 + 2x1x3 + 2x2x3 where x = (x1x2x3)t
How do I write down the matrix A of the quadratic form Q in the standard matrix E. and how do I find the numeric values for \lambda
 
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