Question

Add
x2 + y2 + z2 - 2xy + 2yz + 2zx, x2 + y2 + 4z2 + 2xy + 4yz + 4zx and
9x2 + y2 + z2- 6xy + 2yz - 6zx​

Answer 1

Answer:

The answer is 11x2 + 3y2 + 6z2 - 6xy + 8yz

Step-by-step explanation:

Here is your answer dude

x2 + y2 + z2 - 2xy + 2yz + x2 + y2 + 4z2 + 2xy + 4yx + 4zx + 9x2 + y2 + z2 - 6xy + 2yz - 6zx

Now combine the like terms like this

x2 + x2 + 9x2 + y2 + y2 + y2 + z2 + 4z2 + z2 - 2xy + 2xy - 6xy + 2yz + 4yz + 2yz + 2zx + 4zx - 6zx

Now by further solving we get

11x2 + 3y2 + 6z2 - 6xy + 8yz

This is your answer

Answer 2

Answer:

Social groups include two or more people who interact and share a sense of unity and common identity. Primary groups are small and characterized by close, personal relationships that last a long time. Secondary groups include impersonal, temporary relationships that are goal-oriented.Social change involves alteration of the social order of a society. It may include changes in social institutions, social behaviours or social relations.Social change is way human interactions and relationships transform cultural and social institutions over time, having a profound impact of society. ... Relationships have changed, institutions have changed, and cultural norms have changed as a result of these social change movements.Social groups include two or more people who interact and share a sense of unity and common identity. Primary groups are small and characterized by close, personal relationships that last a long time. Secondary groups include impersonal, temporary relationships that are goal-oriented.