Answer:

Explanation:
Opposite of a number is the value that gives 0 ( additive identity ) if added to the number.
Generally, by changing the sign we can get the opposite of a number.
Let x be the required number,
So, its opposite is -x,
Also, we get quotient after division,
Now, given phrase,
The quotient of the opposite of x squared and three

Which is the required expression.