Solve the Quadratic Equation with Fractions: x²/2 - x + 2/3 = 0

Quadratic Equations with Negative Discriminant

Solve the following equation:

x22x+23=0 \frac{x^2}{2}-x+\frac{2}{3}=0

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:04 Multiply by 6 to eliminate fractions
00:16 Identify the coefficients
00:29 Use the roots formula
00:47 Substitute appropriate values according to the given data and solve
01:09 Calculate the square and products
01:24 There's no such thing as a root of a negative number
01:34 Therefore there is no solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following equation:

x22x+23=0 \frac{x^2}{2}-x+\frac{2}{3}=0

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the provided equation and standardize it.
  • Step 2: Determine the coefficients aa, bb, and cc.
  • Step 3: Compute the discriminant b24acb^2 - 4ac.
  • Step 4: Analyze the discriminant to determine the nature of the solutions.

Let's work through each step:

Step 1: The given equation is x22x+23=0\frac{x^2}{2} - x + \frac{2}{3} = 0. For simplicity, we multiply through by 6 to clear fractions:
This becomes 3x26x+4=03x^2 - 6x + 4 = 0.

Step 2: Identify coefficients for the quadratic formula:
a=3a = 3, b=6b = -6, and c=4c = 4.

Step 3: Compute the discriminant b24acb^2 - 4ac:
Discriminant =(6)24×3×4=3648=12= (-6)^2 - 4 \times 3 \times 4 = 36 - 48 = -12.

Step 4: Analyze the discriminant:
The discriminant is negative (12-12), indicating no real solutions.

No solution exists for this equation in the real number set.

Therefore, the solution to the problem is: No solution.

3

Final Answer

No solution

Key Points to Remember

Essential concepts to master this topic
  • Rule: Clear fractions first by multiplying by the LCD
  • Technique: Calculate discriminant: b24ac=3648=12 b^2 - 4ac = 36 - 48 = -12
  • Check: Negative discriminant means no real solutions exist ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to multiply all terms when clearing fractions
    Don't multiply only some terms by 6 and leave others unchanged = wrong equation! This creates an unbalanced equation with incorrect coefficients. Always multiply every single term on both sides by the same number to clear fractions.

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

What does it mean when the discriminant is negative?

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A negative discriminant means the quadratic equation has no real solutions. The parabola doesn't cross the x-axis, so there are no x-intercepts.

Why do we multiply by 6 to clear fractions?

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We find the LCD of 2 and 3, which is 6. Multiplying every term by 6 eliminates all fractions: x22 \frac{x^2}{2} becomes 3x2 3x^2 , and 23 \frac{2}{3} becomes 4.

Could I have made an error if I got no solution?

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It's possible! Always double-check your arithmetic when clearing fractions and calculating the discriminant. Verify: (6)24(3)(4)=3648=12 (-6)^2 - 4(3)(4) = 36 - 48 = -12 .

Are there complex solutions to this equation?

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Yes! While there are no real solutions, this equation has two complex solutions involving 12=2i3 \sqrt{-12} = 2i\sqrt{3} . But for now, we focus on real number solutions only.

How can I visualize why there's no solution?

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Think of the quadratic as a parabola! Since a=3>0 a = 3 > 0 , it opens upward. The negative discriminant means this parabola never touches the x-axis - it's always above it.

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