There are three equations you will need. Write these down!
b is the root, x is the large number, y is the answer.
x = b^y is the same as y = logb(x) is the same as
y = broot(x).
x^t = 10
means t = logx(10) or t = xroot(10)
so x^(2 + t) means (2 + t) = logx(value)