Home
Class 12
MATHS
The quadratic equation x^2+m x+n=0 has r...

The quadratic equation `x^2+m x+n=0` has roots which are twice those of `x^2+p x+m=0a dm ,na n dp!=0.` The n the value of `n//p` is _____.

Text Solution

Verified by Experts

The correct Answer is:
8

`x^(2)+mx+n=0andx^(2)+px+m=0`
`2(alpha+beta)=-m" "(1)`
`4alphabeta-n" "(2)`
and `alpha+beta=-p" "(3)`
`alphabeta=m" "(4)`
`:.(1)and(3)implies2p=m` and `(2)and(4)implies4m=n`
`implies(n)/(p)=(4m)/(m//2)=8`
Promotional Banner

Topper's Solved these Questions

  • THEORY OF EQUATIONS

    CENGAGE ENGLISH|Exercise Archives JEE MAIN (single correct Answer Type )|7 Videos
  • THEORY OF EQUATIONS

    CENGAGE ENGLISH|Exercise JEE ADVANCED (Single Correct Type )|5 Videos
  • THEORY OF EQUATIONS

    CENGAGE ENGLISH|Exercise MATRIX MATCH TYPE|6 Videos
  • STRAIGHT LINES

    CENGAGE ENGLISH|Exercise ARCHIVES (NUMERICAL VALUE TYPE)|1 Videos
  • THREE DIMENSIONAL GEOMETRY

    CENGAGE ENGLISH|Exercise All Questions|294 Videos

Similar Questions

Explore conceptually related problems

The quadratic equation x^(2) - (m -3)x + m =0 has

Let alpha,beta in Rdot If alpha,beta^2 are the roots of quadratic equation x^2-p x+1=0a n dalpha^2,beta is the roots of quadratic equation x^2-q x+8=0 , then the value of rifr/8 is the arithmetic mean of p a n d q , is

The equation 3x^(2)-12x+(n-5)=0 has equal roots. Find the value of n.

The equation 3x^(2)-12x+(n-5)=0 has repeated roots. Find the value of of n.

If-4 is a root of the quadratic equation x^2+p x-4=0 and the quadratic equation x^2+p x+k=0 has equal roots, find the value of kdot

If 2 is a root of the quadratic equation 3x^2+p x-8=0 and the quadratic equation 4x^2-2p x+k=0 has equal roots, find the value of kdot

If quadratic equation x^(2)-(m+1)x+6=0 has one root as x=3 , find the value of m and the other root of the equations.

If the quadratic equation 2x^(2)+5x+1=0 has roots p and q,what is the value of the expression (2-p)(2-q)?

If alpha,beta in R and the quadratic equations x^2+2x+7=0a n d4x^2+alphax+beta=0 have atleast one common roots, then the value of alpha+beta is

If -5 is a root of the quadratic equation 2x^2+p x-15=0 and the quadratic equation p(x^2+x)+k=0 has equal roots, find the value of kdot

CENGAGE ENGLISH-THEORY OF EQUATIONS-NUMERICAL VALUE TYPE
  1. Let alpha1,beta1 be the roots x^2-6x+p=0a n d alpha2,beta2 be the root...

    Text Solution

    |

  2. Let alphaa n dbeta be the solutions of the quadratic equation x^2-1154...

    Text Solution

    |

  3. The quadratic equation x^2+m x+n=0 has roots which are twice those of ...

    Text Solution

    |

  4. Suppose a ,b ,c are the roots of the cubic x^3-x^2-2=0. Then the value...

    Text Solution

    |

  5. Polynomial P(x) is divided by (x-3) , the remainder if 6.If P(x) is di...

    Text Solution

    |

  6. If alphaandbeta are the roots of the equation x^(2)-6x+12=0 and the va...

    Text Solution

    |

  7. Let aa n db be the roots of the equation x^2-10 c x-11 d=0 and those o...

    Text Solution

    |

  8. Let a,binRandabne1."If "6a^(2)+20a+15=0and15b^(2)+20b+6=0 then the va...

    Text Solution

    |

  9. If there exists at least one real x which satisfies both the equatios ...

    Text Solution

    |

  10. If the equation x 62+2(lambda+1)x+lambda^2+lambda+7=0 has only negativ...

    Text Solution

    |

  11. All the values of k for which the quadratic polynomial f(x)=2x^2+k x+k...

    Text Solution

    |

  12. If set of values a for which f(x)=a x^2-(3+2a)x+6a!=0 is positive for ...

    Text Solution

    |

  13. a ,b ,a n dc are all different and non-zero real numbers on arithmetic...

    Text Solution

    |

  14. Let P(x)=5/4+6x-9x^2a n dQ(y)=-4y^2+4y+(13)/2dot if there exists uniqu...

    Text Solution

    |

  15. If equation x^4-(3m+2)x^2+m^2=0(m >0) has four real solutions which ar...

    Text Solution

    |

  16. If the equation 2x^2+4x y+7y^2-12 x-2y+t=0, where t is a parameter has...

    Text Solution

    |

  17. Let P(x0=x^3-8x^2+c x-d be a polynomial with real coefficients and wit...

    Text Solution

    |

  18. Let P(x)=x^4+a x^3+b x^2+c x+d be a polynomial such that P(1)=1,P(2)=8...

    Text Solution

    |

  19. Suppose a ,b ,c in I such that the greatest common divisor for x^2+a ...

    Text Solution

    |

  20. Integral part of the product of non-real roots of equation x^(4)-4x^(3...

    Text Solution

    |