Solve the Equation x⁶-4x⁴=0: Sixth-Degree Polynomial Problem

Polynomial Factoring with Zero Product Property

x64x4=0 x^6-4x^4=0

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:03 Factor with X to the fourth power
00:12 Take out the common factor from parentheses
00:23 This is one solution that zeros the equation
00:28 Now let's check which solutions zero the second factor
00:31 Isolate X
00:36 Extract root, remember when extracting root there are always 2 solutions
00:39 Positive and negative solution
00:42 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

x64x4=0 x^6-4x^4=0

2

Step-by-step solution

To solve this problem, we start by factoring the given equation:

The equation is x64x4=0 x^6 - 4x^4 = 0 . Notice that both terms contain a power of x x . We can factor out the greatest common factor, which is x4 x^4 .

This yields x4(x24)=0 x^4(x^2 - 4) = 0 .

Next, we apply the zero-product property, which states that if a product of factors equals zero, at least one of the factors must be zero:

  • First factor: x4=0 x^4 = 0 . This implies that x=0 x = 0 .
  • Second factor: x24=0 x^2 - 4 = 0 . We solve this quadratic equation by factoring further:

The quadratic equation x24=0 x^2 - 4 = 0 can be factored using the difference of squares:

(x2)(x+2)=0 (x - 2)(x + 2) = 0 .

Again applying the zero-product property, we set each factor equal to zero:

  • For x2=0 x - 2 = 0 , x=2 x = 2 .
  • For x+2=0 x + 2 = 0 , x=2 x = -2 .

Thus, the complete set of solutions to the equation is x=0,x=2,x=2 x = 0, x = 2, x = -2 .

Therefore, the solution to the problem is x=0,x=±2 x = 0, x = \pm 2 .

3

Final Answer

x=0,x=±2 x=0,x=\pm2

Key Points to Remember

Essential concepts to master this topic
  • Factoring Rule: Extract greatest common factor first: x4(x24)=0 x^4(x^2 - 4) = 0
  • Technique: Use difference of squares: x24=(x2)(x+2) x^2 - 4 = (x-2)(x+2)
  • Check: Substitute each solution back: 064(04)=0 0^6 - 4(0^4) = 0 and (±2)64(±2)4=6464=0 (±2)^6 - 4(±2)^4 = 64 - 64 = 0

Common Mistakes

Avoid these frequent errors
  • Dividing both sides by x⁴ instead of factoring
    Don't divide both sides by x4 x^4 because this eliminates x = 0 from your solution set! Division by zero is undefined, so you lose the solution x = 0. Always factor out common terms and use the zero product property.

Practice Quiz

Test your knowledge with interactive questions

Break down the expression into basic terms:

\( 2x^2 \)

FAQ

Everything you need to know about this question

Why can't I just divide both sides by x⁴?

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Dividing by x4 x^4 assumes x0 x ≠ 0 , but x = 0 is actually a solution! When you divide by a variable, you might lose solutions where that variable equals zero.

How do I know what to factor out first?

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Look for the greatest common factor (GCF) of all terms. Here, both x6 x^6 and 4x4 4x^4 contain x4 x^4 , so factor that out first.

What is the zero product property?

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If a×b=0 a × b = 0 , then either a=0 a = 0 or b=0 b = 0 (or both). This lets us solve each factor separately when a product equals zero.

Why does x⁴ = 0 only give x = 0?

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Even though x4=0 x^4 = 0 looks like it might have multiple solutions, only x = 0 works. Any other number raised to the 4th power gives a positive result, not zero.

How do I recognize difference of squares?

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Look for the pattern a2b2 a^2 - b^2 . Here, x24=x222 x^2 - 4 = x^2 - 2^2 , which factors as (x2)(x+2) (x-2)(x+2) .

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