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

a = Coefficient of x²

b = Coefficient of x

c = Coefficient of the independent number


what is the value of \( a \) in the equation

\( y=3x-10+5x^2 \)

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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