We need to tell the index of x for which x will be 1 , First of all , always remember that index of a number means power of the number or to which power it's raised to, like in 2³ , 2 is raised to 3 so 3 is the index. Also we knows an identity i.e
Let's put , m = n
Also , you should note that for a = 0 , the given expression becomes 0⁰ ,which is not defined , so the above expression is true only for
Now , as we can replace variables , so , if we replace a by x , we get x⁰ = 1 .
Hence , the required index is 0