EquationsMCQMTP June 22Question 1089 of 221
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If the ratio of the roots of the equation 4x26x+p=0\displaystyle 4x^2 - 6x + p = 0 is 1:2\displaystyle 1:2, then the value of p\displaystyle p is:

Options

A1\displaystyle 1
B2\displaystyle 2
C1\displaystyle -1
D2\displaystyle -2
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Correct Answer

Option b2\displaystyle 2

All Options:

  • A1\displaystyle 1
  • B2\displaystyle 2
  • C1\displaystyle -1
  • D2\displaystyle -2

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Detailed Solution & Explanation

Given quadratic equation:
4x26x+p=04x^2 - 6x + p = 0
Let the roots be α\displaystyle \alpha and β\displaystyle \beta. Since their ratio is 1:2\displaystyle 1:2, we can let:
β=2α\beta = 2\alpha
Using Vieta's formulas:
1. **Sum of roots:**
α+β=α+2α=3α=ba=64=32\alpha + \beta = \alpha + 2\alpha = 3\alpha = -\frac{b}{a} = \frac{6}{4} = \frac{3}{2}
3α=32    α=123\alpha = \frac{3}{2} \implies \alpha = \frac{1}{2}
Since α=1/2\displaystyle \alpha = 1/2, the roots are 12\displaystyle \frac{1}{2} and 1\displaystyle 1.
2. **Product of roots:**
αβ=(12)(1)=12\alpha\beta = \left(\frac{1}{2}\right)(1) = \frac{1}{2}
From the equation, the product of roots is also c/a=p/4\displaystyle c/a = p/4:
p4=12    p=2\frac{p}{4} = \frac{1}{2} \implies p = 2
This corresponds to Option b.

**Option b**

About This Chapter: Equations

Paper

Paper 3: Quantitative Aptitude

Weightage

4-6 Marks

Key Topics

Linear, Quadratic and Cubic Equations

This chapter covers Linear, Quadratic and Cubic Equations and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 4-6 Marks weightage. Focus on understanding core concepts rather than memorizing.

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