Question

how did the rashtrakutas become powerful​

Answer 1

Explanation:

However, in the mid-eighth century, Rashtrakuta chief Dantidurga defeated his Chalukya overlord and performed the Hiranyagarbha ritual, establishing his right to rule. ... Thus, the Rashtrakutas became powerful in India through a mixture of military prowess and ritualistic actions.

Answer 2

The Rashtrakutas in the Deccan were the subordinate to the Chalukyas of Karnataka. It was during the mid-18th century when Dantidurga, a Rashtrakuta chief, overthrew his Chalukya overlord and performed a ritual called 'Hiranya-garbha' with the help of Brahmanas.