Question

can you answer this ??​

Answer 1

Step-by-step explanation:

B is right answer

Mark as Brainlist please

It will help you

Answer 2

Answer:

15x^2+y^2-2z^2

Step-by-step explanation:

$2 {x}^{2} + 3 {y}^{2} + {z}^{2} + 5 {x}^{2} + 2 {y}^{2} - {z}^{2} + 8 {x}^{2} - 4 {y}^{2} - 2 {z}^{2} \\ = 15 {x}^{2} + {y}^{2} - 2 {z}^{2}$