# Exponential Function Formula

An exponential function is a mathematical expression in which a variable represents the exponent of an expression.

The Exponential Function Formula is given as,

$\large y=a^{x}$

Solved Examples

Question: What is the value of x in x2 =  81 ?

Solution:

x2 = 81
x $\times$  x = 9 $\times$ 9
x = 9

#### Practise This Question

The equation of a progressive wave is y=0.02sin 2π[t0.01x0.30] here x and y are in metres and t is in seconds. The velocity of propagation of the wave is