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4. Examine whether the following quadratic forms are positive definite, negative definite, or indefinite: a. 6x1 + 25x2 + 9X3 - 60x2X3 + 40x1X3 -6X1X2

4. Examine whether the following quadratic forms are positive definite, negative definite, or indefinite: a. 6x1 + 25x2 + 9X3 - 60x2X3 + 40x1X3 -6X1X2 b. 9x2 + 9x3 + 10x2x3 + 6x1X2

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