Learning how to resolve radical equations needs a many practice and also familiarity the the different species of problems. In this lesson, the score is to show you detailed worked services of some problems with varying levels that difficulty.

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What is a Radical Equation?

An equation wherein the variable is had inside a radical symbol or has a rational exponent. In particular, we will deal with the square root which is the consequence of having actually an exponent the Large1 over 2.

Key Steps:

1) isolate the radical price on one side of the equation

2) Square both political parties of the equation to get rid of the radical symbol

3) settle the equation the comes the end after the squaring process

4) examine your answers through the original equationto stop extraneous values

Examples of how to deal with Radical Equations

Example 1: resolve the radical equation


The radical is by itself on one side so the is fine come square both political parties of the equations to remove the radical symbol. Then continue with the usual procedures in solving direct equations.


You must constantly check her answers come verify if they room “truly” the solutions. Part answers from your calculations may be extraneous. Substitute x = 16 back into the initial radical equation to check out whether it returns a true statement.


Yes, the checks, therefore x = 16 is a solution.

Example 2: deal with the radical equation


The setup looks good because the radical is again secluded on one side. For this reason I can square both sides to remove that square source symbol. Be cautious dealing v the best sidewhen friend square the binomial(x−1). You must apply the FOIL method correctly.


We relocate all the state to the right side that the equation and also thenproceed on factoring the end the trinomial. Using the Zero-Product Property, we achieve the values of x = 1 and also x = 3.

Caution: constantly check her calculated valuesfrom the initial radical equation tomake sure that they are true answers and not extraneous or “false” answers.

Looks good for both the our solved values the x after ~ checking, therefore our options are x = 1 and x = 3.

Example 3: solve the radical equation

We must recognize the radical symbol is no isolated just yeton the left side. It means we need to get escape of the −1 prior to squaring both sides of the equation. A simple step of adding both sides by 1 have to take treatment of that problem. After doing so, the “new” equation is similar to the people we have gone overso far.

Our possiblesolutions space x = −2 and x = 5. An alert I use words “possible” since it is not last untilwe carry out our verification process of checking our values versus the original radical equation.

Since us arrive at a false statement when x = −2, therefore that worth of x is taken into consideration to it is in extraneousso we ignore it! leaving us with one true answer, x = 5.

Example 4: fix the radical equation

The left side looks a tiny messy due to the fact that there space two radical symbols.But itis no that bad! always remember the key steps said above. Due to the fact that both the the square roots room on one next that method it’s definitely readyfor the entire radical equation to it is in squared.

So because that our very first step, let’s square both sides and also see what happens.

It is perfectly regular for this type of trouble to see one more radical symbol after the first application the squaring. The good newscoming out from this is the there’s just one left. From this point, tryto isolate again the single radical ~ above the left side, the should force us to relocate the remainder to the contrary side.

As you can see, that streamlined radical equation is definitelyfamiliar. Proceed with the usual way of solving it and also make sure that you always verify the fixed values the x versus the initial radical equation.

I will certainly leave to you to check that indeed x = 4 is a solution.

Example 5: deal with the radical equation

This trouble is very comparable to instance 4. The only distinction is that this time roughly both of the radicals has binomial expressions. The method is additionally to square both sides since the radicals room on one side, and simplify. However we need to perform the second application of squaring to completely get rid of the square source symbol.

The systems is x = 2. You may verify itby substituting the value back into the original radical equation and see that it yields a true statement.

Example 6: settle the radical equation

It looks prefer our first step is come square both sides and also observe what comes the end afterward. Don’t forget to incorporate like terms every time friend square the sides. If it happens that another radical symbol is produced after the very first application the squaring process, then it provides sense to perform it one an ext time. Remember, our goal is to eliminate the radical signs to totally free up the change we room trying to solve or isolate.

Well, it looks choose we will should square both sides again since of the brand-new generated radical symbol. But we have to isolate the radical very first on one next of the equation before doing so. I will save the square source on the left, and also that forces me come move whatever to the right.

Looking an excellent so far! currently it’s time to square both political parties again to finally eliminate the radical.

Be careful though in squaring the left side of the equation. Friend must likewise square that −2 to the left of the radical.

What we have actually now is a quadratic equation in the standard form. The best method to fix for x is to usage the Quadratic Formula wherein a = 7, b = 8, and c = −44.

So the feasible solutions space x = 2, and x = - 22 over 7.

I will leave it come you to examine those two values that “x” earlier into the initial radical equation. Ihope girlfriend agree the x = 2 is the just solution when the other value is an extraneous solution, so disregard it!

Example 7: fix the radical equation

There room two means to strategy this problem. Ns could immediately square both political parties to remove the radicals or multiply the two radicals first then square. Both actions should come at the exact same answers as soon as properly done. Because that this ns will use the second approach.

Next, moveeverything come the left side and also solve the resulting Quadratic equation. You have the right to use the Quadratic formula to fix it, but because it is conveniently factorable I will just variable it out.

The possible solutions then space x = - 5 over 2 and also x = 3.

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I will leave it to you to examine the answers. The only answer need to be x = 3 which makes the various other one one extraneous solution.

Radical Equations Worksheets

Download variation 1
Download variation 2

You might also be interested in:

Simplifying Radical ExpressionsAdding and Subtracting Radical ExpressionsMultiplying Radical ExpressionsRationalizing the Denominator

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