Solve the Polynomial Equation: x^10 - 16x^6 = 0

Polynomial Factoring with Zero Product Property

x1016x6=0 x^{10}-16x^6=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
00:09 Take out the common factor from the parentheses
00:20 This is one solution that zeros the equation
00:26 Now let's check which solutions zero the second factor
00:30 Extract the root
00:35 When extracting a root there are always 2 solutions: positive and negative
00:38 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

x1016x6=0 x^{10}-16x^6=0

2

Step-by-step solution

To solve the equation x1016x6=0 x^{10} - 16x^6 = 0 , follow these steps:

  • Step 1: Notice that the common factor in both terms is x6 x^6 . Factor it out:
  • x6(x416)=0 x^6(x^4 - 16) = 0

  • Step 2: Apply the zero product property, which states if a product equals zero, at least one of the factors must be zero.
    Therefore, we have:
  • x6=0 x^6 = 0 or x416=0 x^4 - 16 = 0

  • Step 3: Solve x6=0 x^6 = 0 :
  • The solution to this is x=0 x = 0 .

  • Step 4: Solve x416=0 x^4 - 16 = 0 :
    • Rewrite it as x4=16 x^4 = 16
    • Take the fourth root of both sides:
    • x=±164=±2 x = \pm\sqrt[4]{16} = \pm2

    Thus, x=2 x = 2 or x=2 x = -2 .

Conclusion: The solutions are x=±2 x = \pm 2 and x=0 x = 0 .

Therefore, the correct answer is: Answers a and c

3

Final Answer

Answers a and c

Key Points to Remember

Essential concepts to master this topic
  • Factoring: Extract common factor x^6 from both terms first
  • Technique: Apply zero product property: if x^6(x^4 - 16) = 0, then x^6 = 0 or x^4 - 16 = 0
  • Check: Verify solutions: 0^10 - 16(0^6) = 0 and 2^10 - 16(2^6) = 0 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to check all factors for zero
    Don't solve only x^4 - 16 = 0 and ignore x^6 = 0 = missing the solution x = 0! This happens when you rush through factoring. Always set each factor equal to zero and solve completely.

Practice Quiz

Test your knowledge with interactive questions

Solve the following equation:


\( 2x^2-8=x^2+4 \)

FAQ

Everything you need to know about this question

Why do I need to factor out x^6 first?

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Factoring out the greatest common factor simplifies the equation! Without it, you'd have to work with a 10th degree polynomial directly, which is much harder than solving two simpler equations.

How do I solve x^4 = 16?

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Take the fourth root of both sides. Since 164=2 \sqrt[4]{16} = 2 , and fourth roots can be positive or negative, you get x = ±2.

Why does x^6 = 0 only give x = 0?

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When you have x^6 = 0, the only number that gives zero when raised to any positive power is zero itself. So x = 0 is the only solution to this part.

What is the zero product property?

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If A × B = 0, then either A = 0 or B = 0 (or both). This lets you split x6(x416)=0 x^6(x^4 - 16) = 0 into two separate, easier equations!

How can I check my answers?

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  • For x = 0: 01016(06)=00=0 0^{10} - 16(0^6) = 0 - 0 = 0
  • For x = 2: 21016(26)=102416(64)=10241024=0 2^{10} - 16(2^6) = 1024 - 16(64) = 1024 - 1024 = 0
  • For x = -2: Same result as x = 2 since all exponents are even ✓

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