Question

Which function is an exponential function?

Options

• \[y=x^n\]

• \[y=\log_b x,\quad b>0,\quad b\ne1\]

• \[y=b^x,\quad b>0,\quad b\ne1\]

• \[y=\sin(\log x)\]

Answer 1

An exponential function has the form \[y=b^x\]. Its base must satisfy \[b>0\] and \[b\ne1\].