Question

What should be subtracted from 2x² - y² + 4z² to get x² + y² - z²?

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Answer 1

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Answer 2

Answer:

$2 {x }^{2} - { {y}^{2} + 4z}^{2} - {x }^{2} - {y}^{2} + {z}^{2} = {x}^{2} - 2 {x}^{2} + 5 {z}^{2}$