Which expression is equivalent to 10 x squared y plus 25 x squared ?

Factor out the greatest common factor, 5x², from both terms: 10x²y ÷ 5x² = 2y and 25x² ÷ 5x² = 5. So the expression becomes 5x²(2y + 5), which is choice C.

AI-written and checked against the verified answer.