2y square + yz - 2z square from 9y square - 3z square
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Answer:
7y² - 1z² - yz
Explanation:
(9y² - 3z²) - (2y² + yz - 2z²)
= 9y² - 3z² - 2y² - yz + 2z²
= (9-2)y² - (3-2)z² - yz
=7y² - 1z² - yz
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