Answer:
6
Explanation:
Let x by the unknown number.
Given:
- Eighty-five more than the square of a number is the same as the square of the quantity that is 17 less than the number.
Therefore, the equation representing the given information is:

To solve for x, expand the right side:



Subtract x² from both sides of the equation:

Add 34x to both sides:

Subtract 85 from both sides:

Divide both sides by 34:

Therefore the unknown number is 6.