How to Solve Radical Equations

How to Solve Radical Equations

An equation that contains a radical expression is called a radical equation, and in this blog post, we will teach you how to solve this type of equations.

Related Topics

A step-by-step guide to solving Radical Equations

  • Isolate the radical on one side of the equation.
  • Square both sides of the equation to remove the radical.
  • Solve the equation for the variable.
  • Plugin the answer (answers) into the original equation to avoid extraneous values.

Examples

Radical Equations – Example 1:

Solve \(\sqrt{x}-5=15\)

Solution:

Add 5 to both sides: \(\sqrt{x}=20\), Square both sides: \((\sqrt{x})^2=20^2→x=400\) Plugin the value of 400 for \(x\) in the original equation and check the answer: \(x=400→\sqrt{x}-5=\sqrt{400}-5=20-5=15\), So, the value of 400 for \(x\) is correct.

Radical Equations – Example 2:

What is the value of \(x\) in this equation? \(2\sqrt{x+1}=4\)

Solution:

Divide both sides by 2. Then: \(2\sqrt{x+1}=4→\frac{2\sqrt{x+1}}{2}=\frac{4}{2}→\sqrt{x+1}=2\) Square both sides: \((\sqrt{(x+1)})^2=2^2\), Then \(x+1=4→x=3\)
Substitute \(x\) by 3 in the original equation and check the answer:
\( x=3→2\sqrt{x+1}=2\sqrt{3+1}=2\sqrt{4}=2(2)=4\)
So, the value of 3 for \(x\) is correct.

Radical Equations – Example 3:

Solve \(\sqrt{x}-8=-3\)

Solution:

Add 8 to both sides: \(\sqrt{x}=5\)
Square both sides: \((\sqrt{x})^2=5^2→x=25\)
Substitute \(x\) by 25 in the original equation and check the answer:
\(x=25→\sqrt{x}-8=\sqrt{25}-8=-3\)
So, the value of 25 for \(x\) is correct.

Radical Equations – Example 4:

What is the value of \(x\) in this equation? \(4\sqrt{x+3}=40\)

Solution:

Divide both sides by 4. Then: \(4\sqrt{x+3}=40→\frac{4\sqrt{x+3}}{4}=\frac{40}{4}→\sqrt{x+3}=10\) Square both sides: \((\sqrt{(x+3)})^2=10^2\), Then \(x+3=100→x=97\)
Substitute \(x\) by 97 in the original equation and check the answer:
\( x=97→4\sqrt{x+3}=4\sqrt{97+3}=4\sqrt{100}=4(10)=40\)
So, the value of 97 for \(x\) is correct.

Exercises for Radical Equations

Solve Radical Equations.

  1. \(\color{blue}{\sqrt{x}+6=8}\)
  2. \(\color{blue}{\sqrt{x}-7=4}\)
  3. \(\color{blue}{\sqrt{x+2}=10}\)
  4. \(\color{blue}{2\sqrt{x-9}=14}\)
  5. \(\color{blue}{\sqrt{2x-5}=\sqrt{x-1}}\)
  6. \(\color{blue}{\sqrt{x+8}=\sqrt{2x+1}}\)
This image has an empty alt attribute; its file name is answers.png
  1. \(\color{blue}{x=4}\)
  2. \(\color{blue}{x=121}\)
  3. \(\color{blue}{x=98}\)
  4. \(\color{blue}{x=58}\)
  5. \(\color{blue}{x=4}\)
  6. \(\color{blue}{x=7}\)

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