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Answer:
5y² + 5z²
Step-by-step explanation:
Sum:
3y² - z² + (-y² + yz + z²)
= 3y² - z² - y² + yz + z²
= 3y² - y² - z² + z² + yz
= 2y² - 0 + yz = 2y² - yz
Sum:
4y² - z² - y² + yz + 6z²
= 4y² - y² - z² + 6z² + yz
= 3y² + 5z² + yz
Subtraction:
3y² + 5z² + yz + 2y² - yz
= 3y² + 2y² + 5z² + yz - yz
= 5y² + 5z² + 0 = 5y² + 5z²
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