given that f(x)=11^x, find x when f(x)=7

Question

a) x=Ln(7/11)
b) x=Ln7/Ln11
c) x= 7/11
d) x= ll sub 7 11

Answer 1

so you solving:
11^x = 7
take ln of both sides

ln(11^x) = ln7
x(ln11) = ln7
x = ln7/ln11