Answer:
Neither 9y^2 nor 10x^2 are perfect squares.
Step-by-step explanation:
The correct answer for the statement "10x^2 - 9y^2 is not the difference of two squares" is:
"Neither 9y^2 nor 10x^2 are perfect squares."
In the expression \(10x^2 - 9y^2\), neither \(9y^2\) nor \(10x^2\) is a perfect square. For it to be the difference of two squares, both terms must be perfect squares.