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Find the matrix for each of the following quadratic forms. (a)    q(x1, x2, x3) =...

Find the matrix for each of the following quadratic forms.

(a)    q(x1, x2, x3) = 7x12 + 3x22 − 4x32 + 12x1x2 + 18x2x3

​b)    q(x1, x2, x3) = x1x2 + x1x3 − x2x3

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