Question

What is the simplified expression for 3y2 - 6yz - 7+4y2 - 4yz+2 - y2z?

y2 - y2z - 10yz - 5

y2 - y2z - 5yz - 5

7y2 - y2z - 10yz - 5

7y2 - y2z - 2yz - 5

Answer 1

`3y {}^(2) - 6yz - 7 + 4 {y}^(2) - \\ \: 4yz + 2 - y {}^(2) z \\`

`3 {y}^(2) + 4y {}^(2) - 6yz + 4yz \\ - 7 + 2 - {y}^(2) z`

`7 {y}^(2) - 10yz - {y}^(2) z - 5`
The answer is the 2nd one from the bottom.
7y2 - y2z - 10yz -5