Find the condition for the lines represented by the equation 2x^2 + 3xy + y^2 =

Practice Questions

Q1
Find the condition for the lines represented by the equation 2x^2 + 3xy + y^2 = 0 to be parallel.
  1. D = 0
  2. D > 0
  3. D < 0
  4. D = 1

Questions & Step-by-Step Solutions

Find the condition for the lines represented by the equation 2x^2 + 3xy + y^2 = 0 to be parallel.
  • Step 1: Understand that the equation 2x^2 + 3xy + y^2 = 0 represents a pair of lines.
  • Step 2: Identify that for two lines to be parallel, they must have the same slope.
  • Step 3: Recall that the condition for a quadratic equation to represent two parallel lines is that the discriminant (D) must be equal to 0.
  • Step 4: The discriminant D for the general quadratic equation Ax^2 + Bxy + Cy^2 = 0 is given by D = B^2 - 4AC.
  • Step 5: In our equation, A = 2, B = 3, and C = 1.
  • Step 6: Substitute these values into the discriminant formula: D = (3)^2 - 4(2)(1).
  • Step 7: Calculate D: D = 9 - 8 = 1.
  • Step 8: Since D is not equal to 0, the lines are not parallel under this condition.
  • Step 9: To find the condition for the lines to be parallel, set D = 0 and solve for the coefficients.
  • Quadratic Equations – Understanding how to analyze the discriminant of a quadratic equation to determine the nature of its roots.
  • Parallel Lines – Recognizing the condition for two lines to be parallel, which involves the relationship between their slopes.
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