Check if roots of a Quadratic Equation are reciprocal of each other or not

Last Updated : 24 Mar, 2021

Given three numbers A, B, C which represents the coefficients(constants) of a quadratic equation $Ax^{2} + Bx + C = 0$ , the task is to check whether the roots of the equation represented by these constants are reciprocal of each other or not.
Examples:

Input: A = 2, B = -5, C = 2
Output: Yes
Explanation:
The given quadratic equation is $2x^{2} - 2 = 0$ .
Its roots are (1, 1/1) which are reciprocal of each other.
Input: A = 1, B = -5, C = 6
Output: No
Explanation:
The given quadratic equation is $x^{2} - 5x + 6 = 0$ .
Its roots are (2, 3) which are not reciprocal of each other.
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Approach: The idea is to use the concept of quadratic roots to solve the problem. We can formulate the condition required to check whether one root is the reciprocal of the other or not by:

Let the roots of the equation be $\alpha$ and $\frac{1}{\alpha}$ .
The product of the roots of the above equation is given by $\alpha$ * $\frac{1}{\alpha}$ .
It is known that the product of the roots is C/A. Therefore, the required condition is C = A.

Below is the implementation of the above approach:

C++

// C++ program to check if roots
// of a Quadratic Equation are
// reciprocal of each other or not
 
#include <iostream>
using namespace std;
 
// Function to check if the roots 
// of a quadratic equation are
// reciprocal of each other or not
void checkSolution(int a, int b, int c)
{
    if (a == c)
        cout << "Yes";
    else
        cout << "No";
}
 
// Driver code
int main()
{
    int a = 2, b = 0, c = 2;
 
    checkSolution(a, b, c);
 
    return 0;
}

Java

// Java program to check if roots 
// of a quadratic equation are 
// reciprocal of each other or not 
class GFG{ 
 
// Function to check if the roots  
// of a quadratic equation are 
// reciprocal of each other or not 
static void checkSolution(int a, int b, int c) 
{ 
    if (a == c) 
        System.out.print("Yes"); 
    else
        System.out.print("No"); 
} 
 
// Driver code 
public static void main(String[] args) 
{ 
    int a = 2, b = 0, c = 2; 
 
    checkSolution(a, b, c); 
} 
} 
 
// This code is contributed by shubham

Python3

# Python3 program to check if roots
# of a Quadratic Equation are
# reciprocal of each other or not
 
# Function to check if the roots 
# of a quadratic equation are
# reciprocal of each other or not
def checkSolution(a, b, c):
 
    if (a == c):
        print("Yes");
    else:
        print("No");
 
# Driver code
a = 2; b = 0; c = 2;
checkSolution(a, b, c);
 
# This code is contributed by Code_Mech

C#

// C# program to check if roots 
// of a quadratic equation are 
// reciprocal of each other or not 
using System;
class GFG{
 
// Function to check if the roots 
// of a quadratic equation are 
// reciprocal of each other or not 
static void checkSolution(int a, int b, int c) 
{ 
    if (a == c) 
        Console.WriteLine("Yes"); 
    else
        Console.WriteLine("No"); 
} 
 
// Driver code 
public static void Main()
{ 
    int a = 2, b = 0, c = 2; 
 
    checkSolution(a, b, c); 
} 
} 
 
// This code is contributed by shivanisinghss2110

Javascript

<script>
 
    // Javascript program to check if roots
    // of a Quadratic Equation are
    // reciprocal of each other or not
     
    // Function to check if the roots 
    // of a quadratic equation are
    // reciprocal of each other or not
    function checkSolution(a, b, c)
    {
        if (a == c)
            document.write("Yes");
        else
            document.write("No");
    }
 
    let a = 2, b = 0, c = 2;
  
    checkSolution(a, b, c);
     
</script>

Output:

Yes

Time Complexity: O(1)

Auxiliary Space: O(1)

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Table of Contents

Check if roots of a Quadratic Equation are reciprocal of each other or not

C++

Java

Python3

C#

Javascript

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