2xyz^4 - 3z^2 + xy - 9 =
2 * 1 * (-2) * (√2)^4 - 3 * (√2)² + 1 * (-2) - 9 =
(-4) * 4 - 3 * 2 + (-2) - 9 = -16 - 6 - 2 - 9 = -24 - 9 = - 33
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2xyz^4 - 3z^2 + xy - 9 =
2 * 1 * (-2) * (√2)^4 - 3 * (√2)² + 1 * (-2) - 9 =
(-4) * 4 - 3 * 2 + (-2) - 9 = -16 - 6 - 2 - 9 = -24 - 9 = - 33