Classify the following quadratic forms: (a) 2x² + y² +22² - 2xy - 2yz (b) 3x² + 7y² +22² - 4xy - 4xz (c) 16x² + 36y² + 172² + 32xy + 32xz +16yz (d) -21x² + 30xy-12xz - 11y² + 8yz - 22²2 x²-3y²-52² + 2xy + 2xz + 2yz (e)

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