The following information will help us with this problem:
When we use that information in the context of this problem, we can find:
Thus, a = 15, b = 7, and c = 4.
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![\sqrt[m]{x^n} = x^{(n)/(m)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/9xuhvwm8qp9j81uxgq6vbxc9qqcp6z5p3s.png)
![\sqrt[4]{15^7} = 15^{(7)/(4)}](https://img.qammunity.org/2019/formulas/mathematics/middle-school/asncb18lianj53fo7fm5pf93bkacum7g1s.png)