Question

please help me in this question ​

Answer 1

Answer:

I don't know hchclvvdsXldlbjxptndpGtlueuxgdunlzprnevgclhdgxgvlbuk

Answer 2

Answer:

= $3x^{2} - 4y^{2} - 6z^{2} / 2$

Step-by-step explanation:

$(x^{2} + y^{2} +z^{2} / 2)$ $- (4x^{2} + 5y^{2} + 7y^{2} / 2)$

= $3x^{2} - 4y^{2} - 6z^{2} / 2$