## EQUATIONS CONTAINING VARIABLES UNDER ONE OR MORE RADICALS

**Note:
**

**
**

** In order to solve for ***x*, you must isolate *x*.

** In order to isolate ***x*, you must remove it from under the
radical.

** If there is just one radical in the equation, isolate the
radical.
**

** Then raise both sides of the equation to a power equal to
the index of the radical.
**

** With these types of equations, sometimes there are
extraneous solutions; therefore, you must check your answers.
**

** If the index of the radical is even, many times there will
be a restriction on the values of ***x*.

Example 2:

First make a note of the fact that you cannot take the square root of
a negative number. Therefore, or .

Subtract 5*x* from both sides of the equation so that the radical term is
isolated.

Square both sides of the equation:

Subtract 2*x* from and add 5 to both sides of the equation.

Solve using the quadratic formula.

Simplify.

There are no real solutions.

You can check the answer by graphing the equation:

The graph represents the right side of the original equation minus the
left side of the original equation. Since there are no x-intercepts,
there is no real solution to the equation.

**
If you would like to work another example, click on Example.
**
If you would like to test yourself by working some problems similar
to this example, click on Problem.

If you would like to go back to the equation table of contents, click
on Contents.

** **

**
[Algebra]
[Trigonometry]
****
[Geometry]
[Differential
Equations]
****
[Calculus]
[Complex Variables]
[Matrix Algebra]
****
**

S.O.S. MATHemathics home
page
Do you need more help? Please post your question on our
S.O.S. Mathematics CyberBoard.

** Author: Nancy
Marcus **

Copyright © 1999-2017 MathMedics, LLC. All rights reserved.

Contact us

Math Medics, LLC. - P.O. Box 12395 - El Paso TX 79913 - USA

users online during the last hour