Home
Class 12
MATHS
Statement -1 In the equation ax^(2)+3x+5...

Statement -1 In the equation `ax^(2)+3x+5=0`, if one root is reciprocal of the other, then `a` is equal to 5.
Statement -2 Product of the roots is 1.

A

Statement -1 is true, Statement -2 is true, Statement -2 is a correct explanation for Statement-1

B

Statement -1 is true, Statement -2 is true, Statement -2 is not a correct explanation for Statement -1

C

Statement -1 is true, Statement -2 is false

D

Statement -1 is false, Statement -2 is true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the quadratic equation given and determine the conditions under which one root is the reciprocal of the other. ### Step-by-Step Solution: 1. **Understanding the Equation**: We start with the quadratic equation given: \[ ax^2 + 3x + 5 = 0 \] where \( a \) is a coefficient that we need to determine. 2. **Reciprocal Roots Condition**: If one root is the reciprocal of the other, we can denote the roots as \( \alpha \) and \( \beta \). The condition for reciprocal roots is: \[ \alpha \cdot \beta = 1 \] 3. **Using Vieta's Formulas**: According to Vieta's formulas for a quadratic equation \( ax^2 + bx + c = 0 \): - The sum of the roots \( \alpha + \beta = -\frac{b}{a} \) - The product of the roots \( \alpha \cdot \beta = \frac{c}{a} \) For our equation: - \( b = 3 \) - \( c = 5 \) Therefore, the product of the roots is: \[ \alpha \cdot \beta = \frac{5}{a} \] 4. **Setting the Product Equal to 1**: Since we know that \( \alpha \cdot \beta = 1 \) (because they are reciprocal), we can set up the equation: \[ \frac{5}{a} = 1 \] 5. **Solving for \( a \)**: To find \( a \), we multiply both sides of the equation by \( a \): \[ 5 = a \] 6. **Conclusion**: Thus, we find that: \[ a = 5 \] ### Final Verification: - If \( a = 5 \), the equation becomes: \[ 5x^2 + 3x + 5 = 0 \] - The product of the roots is: \[ \alpha \cdot \beta = \frac{5}{5} = 1 \] - This confirms that the roots are indeed reciprocal.

To solve the problem, we need to analyze the quadratic equation given and determine the conditions under which one root is the reciprocal of the other. ### Step-by-Step Solution: 1. **Understanding the Equation**: We start with the quadratic equation given: \[ ax^2 + 3x + 5 = 0 ...
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • THEORY OF EQUATIONS

    ARIHANT MATHS ENGLISH|Exercise Exercise (Subjective Type Questions)|24 Videos
  • THEORY OF EQUATIONS

    ARIHANT MATHS ENGLISH|Exercise Exercise (Questions Asked In Previous 13 Years Exam)|35 Videos
  • THEORY OF EQUATIONS

    ARIHANT MATHS ENGLISH|Exercise MATCH TYPE|2 Videos
  • THE STRAIGHT LINES

    ARIHANT MATHS ENGLISH|Exercise Exercise (Questions Asked In Previous 13 Years Exam)|17 Videos
  • THREE DIMENSIONAL COORDINATE SYSTEM

    ARIHANT MATHS ENGLISH|Exercise Three Dimensional Coordinate System Exercise 12 : Question Asked in Previous Years Exam|2 Videos

Similar Questions

Explore conceptually related problems

For the equation 3x^2+p x+3=0,p >0, if one of the root is square of the other, then p is equal to 1//3 b. 1 c. 3 d. 2//3

If one root of the equation 6x^2 − 2 x + ( λ − 5 ) = 0 be the reciprocal of the other, then λ =

Knowledge Check

  • If one root of the equation ax^(2) + bx + c = 0 is the reciprocal of the other root, then

    A
    a + b = 0
    B
    a - b = 0
    C
    a - c = 0
    D
    b - c = 0
  • If one root of the equation 3x^(2)-5x+lambda=0 is the reciprocal of the other, then the value of lambda is

    A
    `(1)/(3)`
    B
    `-3`
    C
    3
    D
    1
  • Similar Questions

    Explore conceptually related problems

    Solve the equation x^3 -x^2 +3x +5=0 one root being 1-2i.

    If one root of the quadratic equation 3x^(2)-10x+k=0 is reciprocal of the other, find the value of k.

    Statement -1: The equation who roots are reciprocal of the roots of the equation 10x^(2) -x-5=0" is " 5x^(2) +x-10=0 and Statement -2 : To obtain a quadratic equation whose roots are reciprocal of the roots of the given equation ax^(2) +bx +c=0 change the coefficients a,b,c,to c,b,a. (c ne 0)

    If one root of the equation (k-1)x^(2) - 10x+ 3 = 0 is the reciprocal of the other, then the value of k is___________ .

    Find the equation whose roots are reciprocals of the roots of 5x^(2)+6x+7=0 .

    If (m^2-3)x^2+3mx+ 3m+1=0 has roots which are reciprocals of each other, then the value of m equals to