7. Book II, Problem 22. Find two numbers such that the square of either added to
the sum of both gives a square. [Hint: If the numbers are taken to be x and
x + 1, then one condition is satisfied.]
8. Book III, Problem 12. Find three numbers such that the product of any two
added to the third gives a square. [Hint: Let the numbers be x, x + 6, and 9,
so that one condition is satisfied.]