# How do you solve #4^x+4>=21# using a graph?

##### 1 Answer

Mar 8, 2017

Solution is

#### Explanation:

To solve

These are

and graph appears as follows:

graph{4^x+4 [-1, 3, -5, 30]}

As is observed by zooming the graph near the place, where

graph{4^x+4 [1.68, 2.18, 16.944, 21.32]}

Actually solution is