Find the sub-duplicate ratio of 9x²a⁴ : 25y⁶b²

Sub-duplicate ratio of 9x²a⁴ : 25y⁶b²

$= \sqrt{9x^2a^4} : \sqrt{25y^6b^2} \\[1em] = 3xa^2 : 5y^3b$

Hence, sub-duplicate ratio of 9x²a⁴ : 25y⁶b² = 3xa² : 5y³b.