Given:
The expression is:

To find:
The index form of a the given expression.
Solution:
Index form is the exponent form.
We have,

Here, a is multiplied with itself 3 times, c is multiplied with itself 4 times and 5 is with itself 4 times. So, the power of a, c and 5 must be 3, 4 and 4 respectively.

Therefore, the index form of the given expression is
.