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The roots of the equation $3x^{2} + 5x - a = 0$ are the reciprocals of each other. What is the value of $a$?

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
$-3$

Quadratic Equation Reciprocal Roots

For a general quadratic equation $Ax^2 + Bx + C = 0$, let the roots be $\alpha$ and $\beta$. The product of the roots is given by the formula $\alpha \beta = \frac{C}{A}$.

In this problem, the roots are stated to be reciprocals of each other. Let the roots be $\alpha$ and $\frac{1}{\alpha}$.

Applying the product of roots formula:

$ \alpha \times \frac{1}{\alpha} = \frac{C}{A} $

Simplifying the left side gives:

$ 1 = \frac{C}{A} $

This condition implies that $A = C$.

Finding 'a' in $3x^2 + 5x - a = 0$

Compare the given equation $3x^2 + 5x - a = 0$ with the standard form $Ax^2 + Bx + C = 0$.

  • The coefficient $A$ is $3$.
  • The coefficient $B$ is $5$.
  • The constant term $C$ is $-a$.

Determining the Value of 'a'

Using the condition $A = C$ derived from the reciprocal roots property:

$ 3 = -a $

To find the value of $a$, multiply both sides by $-1$:

$ a = -3 $

Thus, the value of $a$ is $-3$.

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Important Questions from Quadratic Equation

  1. If \(\rm \left( \frac{x}{x+1} \right)^2 -5 \left( \frac{x}{x+1} \right) +6=0 \) , then the value of  \(\rm \left( 1+\frac{1}{x} \right) \)  is equal to :
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  3. Number of real roots of the quadratic equation 3x 2+ 4x + 25 = 0 is

  4. The value of m for which one of the root of x 2 - 3x + 2m = 0 is double of the root of x 2 - x + m = 0 is:

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