Quadratic Form Q: Matrix A & Lambda Calculation

[squenshl]

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 $$\lambda$$

 

[squenshl]

Never mind. Got it