Question

pls tell me the answer pls friends plsssss​

Answer 1

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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