Solve the Quadratic Equation: x²/4 + x/2 + 1/4 = 0

Quadratic Equations with Perfect Square Trinomials

Solve the following equation:

x24+x2+14=0 \frac{x^2}{4}+\frac{x}{2}+\frac{1}{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 Multiply by 4 to eliminate fractions
00:16 Identify the coefficients
00:29 Use the roots formula
00:48 Substitute appropriate values according to the given data and solve
01:08 Calculate the square and products
01:19 A root of 0 is always equal to 0
01:31 When the root equals 0, there will be only one solution to the equation
01:47 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

Solve the following equation:

x24+x2+14=0 \frac{x^2}{4}+\frac{x}{2}+\frac{1}{4}=0

2

Step-by-step solution

To solve the equation x24+x2+14=0 \frac{x^2}{4}+\frac{x}{2}+\frac{1}{4}=0 , we will follow these steps:

  • Convert the equation to standard quadratic form.
  • Identify the coefficients a a , b b , and c c .
  • Apply the quadratic formula.
  • Calculate the discriminant and solve for x x .

Step 1: The given equation is:
x24+x2+14=0\frac{x^2}{4} + \frac{x}{2} + \frac{1}{4} = 0.

To convert it into standard form ax2+bx+c=0 ax^2 + bx + c = 0 , multiply the entire equation by 4 to eliminate the denominators:

x2+2x+1=0 x^2 + 2x + 1 = 0 .

Step 2: Identify the coefficients:

  • a=1 a = 1
  • b=2 b = 2
  • c=1 c = 1

Step 3: Apply the quadratic formula x=b±b24ac2a x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} .

Step 4: Calculate the discriminant b24ac b^2 - 4ac :

b24ac=(2)24(1)(1)=44=0 b^2 - 4ac = (2)^2 - 4(1)(1) = 4 - 4 = 0 .

Since the discriminant is 0, we have one real repeated solution.

Step 5: Solve for x x :

x=2±02(1)=22=1 x = \frac{-2 \pm \sqrt{0}}{2(1)} = \frac{-2}{2} = -1 .

Therefore, the solution to the equation is x=1 x = -1 .

3

Final Answer

x=1 x=-1

Key Points to Remember

Essential concepts to master this topic
  • Standard Form: Clear fractions by multiplying entire equation by LCD
  • Discriminant Test: When b24ac=0 b^2 - 4ac = 0 , expect one repeated solution
  • Verification: Substitute x=1 x = -1 back: 1412+14=0 \frac{1}{4} - \frac{1}{2} + \frac{1}{4} = 0

Common Mistakes

Avoid these frequent errors
  • Forgetting to multiply ALL terms when clearing fractions
    Don't multiply just x24 \frac{x^2}{4} by 4 and leave other terms unchanged = wrong coefficients! This creates an entirely different equation. Always multiply every single term by the LCD to maintain equality.

Practice Quiz

Test your knowledge with interactive questions

What is the value of X in the following equation?

\( X^2+10X+9=0 \)

FAQ

Everything you need to know about this question

Why multiply by 4 instead of just working with fractions?

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Clearing fractions makes everything easier! Working with x2+2x+1=0 x^2 + 2x + 1 = 0 is much simpler than using the quadratic formula with fractional coefficients.

What does it mean when the discriminant equals zero?

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A discriminant of zero means one repeated solution! The parabola just touches the x-axis at exactly one point. This happens when you have a perfect square trinomial like (x+1)2 (x + 1)^2 .

Could I factor this instead of using the quadratic formula?

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Absolutely! After clearing fractions, x2+2x+1 x^2 + 2x + 1 factors as (x+1)2=0 (x + 1)^2 = 0 , giving x=1 x = -1 . Factoring is often faster when possible!

How do I recognize a perfect square trinomial?

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Look for the pattern a2+2ab+b2 a^2 + 2ab + b^2 . Here, x2+2x+1 x^2 + 2x + 1 fits because the middle term 2x is twice the product of x x and 1 1 .

Why does this equation have only one solution?

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When a quadratic has a discriminant of zero, the two solutions are identical! It's like having x=1 x = -1 twice, so we call it a repeated root or double root.

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