About Solving Radical Equations Higher Roots:

We will often encounter radical equations with higher-level roots. These problems will mostly contain cube roots and fourth roots. Additionally, we may need to solve a radical equation that contains mixed roots. Solving this type of equation involves finding the LCM of the two indexes.


Test Objectives
  • Demonstrate the ability to solve a radical equation with cube roots
  • Demonstrate the ability to solve a radical equation with fourth roots
  • Demonstrate the ability to solve a radical equation with mixed roots
Solving Radical Equations Higher Roots Practice Test:

#1:

Instructions: solve each equation.

$$a)\hspace{.2em}\large\sqrt[3]{2x - 1}=-2$$


#2:

Instructions: solve each equation.

$$a)\hspace{.2em}\large\sqrt[4]{5x - 4}+ 5=7$$


#3:

Instructions: solve each equation.

$$a)\hspace{.2em}\large\sqrt{5\sqrt{3x - 11}}=\sqrt{x + 11}$$


#4:

Instructions: solve each equation.

$$a)\hspace{.2em}\large\sqrt{7\sqrt{6x + 9}}=\sqrt{5x + 3}$$


#5:

Instructions: solve each equation.

$$a)\hspace{.2em}\large\sqrt{x + 1}=\sqrt[3]{4x - 5}$$


Written Solutions:

#1:

Solutions:

$$a)\hspace{.2em}x=-\frac{7}{2}$$


#2:

Solutions:

$$a)\hspace{.2em}x=4$$


#3:

Solutions:

$$a)\hspace{.2em}x=9,44$$


#4:

Solutions:

$$a)\hspace{.2em}x=12$$


#5:

Solutions:

$$a)\hspace{.2em}x=\frac{5 + \sqrt{13}}{2}, 8$$