Answer:
The solution, a=15, b=7 and c=4
Step-by-step explanation:
Given: ![\sqrt[4]{15^7}](https://tex.z-dn.net/?f=%5Csqrt%5B4%5D%7B15%5E7%7D)
using exponent and surds rule to change exponent to radical form or radical to exponent form.
Rule: ![\sqrt[n]{a^m}=a^{\frac{m}{n}}](https://tex.z-dn.net/?f=%5Csqrt%5Bn%5D%7Ba%5Em%7D%3Da%5E%7B%5Cfrac%7Bm%7D%7Bn%7D%7D)
Now we compare the given expression
![\sqrt[n]{a^m}=\sqrt[4]{15^7}](https://tex.z-dn.net/?f=%5Csqrt%5Bn%5D%7Ba%5Em%7D%3D%5Csqrt%5B4%5D%7B15%5E7%7D)

It is equal to 
Compare both solution




Hence, The solution a=15, b=7 and c=4