(x^?)^5=x^20

In order for the equation to be true, the exponent on the left side of the equation must equal the exponent on the right side of the equation. So, we need to solve for the value of "?":

(x^?)^5 = x^20

Using the property of exponents, when we raise a power to another power, we multiply the exponents:

x^(?=20) = x^20

Since the bases are the same (x), the exponents must also be the same. Therefore, "? = 20".

So, (x^20)^5 = x^20 is true when "? = 20".