Answer:
a=4/3
Explanation:
Raise both sides of exqn to power 3,
81 x^15 y^9= 3^3a x^15 y^9
⇒ 3^3a=81
⇒ (3)^3a= (3)^4
Bases are same so equate the powers,,
3a=4
⇒a= 4/3
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