Solve the Equation x⁴ - 8x = 0: Finding All Solutions

Question

x48x=0 x^4-8x=0

Video Solution

Solution Steps

00:00 Find X
00:03 Factor with term X
00:10 Take out the common factor from parentheses
00:23 This is one solution that zeroes the equation
00:27 Now let's solve the second term
00:31 Isolate X
00:36 Extract the cube root
00:49 Break down 8 into 2 cubed
00:52 Simplify what we can
00:55 And this is the solution to the question

Step-by-Step Solution

To solve the equation x48x=0 x^4 - 8x = 0 , we'll follow these steps:

  • Step 1: Factor out the greatest common factor.
  • Step 2: Set each factor equal to zero and solve for x x .

Now, let's work through each step:
Step 1: The equation given is x48x=0 x^4 - 8x = 0 . Both terms on the left contain x x as a factor. We can factor out x x to rewrite the equation as:

x(x38)=0 x(x^3 - 8) = 0

Step 2: To find the solutions, set each factor to zero.

If x=0 x = 0 , then one solution is:

x=0 x = 0

Next, solve for x x in the equation x38=0 x^3 - 8 = 0 :
Add 8 to both sides:

x3=8 x^3 = 8

Take the cube root of both sides:

x=83=2 x = \sqrt[3]{8} = 2

Therefore, the solutions to the equation x48x=0 x^4 - 8x = 0 are x=0 x = 0 and x=2 x = 2 .

Thus, the correct answer is: x=0,2 x = 0, 2 .

Answer

x=0,2 x=0,2