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7) Consider the quadratic form Q(x, y, w) = 8x2 + ay + 8xy + w2. Find all the values of a for which the

7) Consider the quadratic form Q(x, y, w) = 8x2 + ay + 8xy + w2. Find all the values of a for which the determinantal test (on leading principal minors) implies that Q(x, y, w) is indefinite

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