Solving a radical inequality is nearly the same as solving an equation. In fact, we solve the equation first using the x-intercept method, then analyze the graph to determine the solution set of the inequality. To solve the inequality
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, first get a
zero on the right: 
. Then replace the
inequality symbol with an equal sign: 
. This equation was solved in the previous example using
CALC zero and the solution was determined to be x = 27. The graph of
the function represented by the left side of the equation, 
, is shown along with the zero.
