The answer to this problem is computed by:
Area as we know is the amount that states the degree of a two-dimensional figure or planar lamina in a plane. Plugging in our given values in s, will give us:
A = s^2
A = (7n^3)^2
A = (7^2)*(n^3)^2
A = (7^2)*n^(3*2)
A = 49n^6