Question

Which equation finds the area of a square with a side length of 5n^4 units

Answer 1

The answer is the third one.

Answer 2

The area of a square is its side elevated to two, like this:
$(5n^4)^2=5^2(n^4)^2=25n^{4\times 2}=25n^{8}$

The correct answer is the first one.