Home
Class 12
MATHS
The minimum value of the sum of real num...

The minimum value of the sum of real numbers `a^-5, a^-4, 3a^-3, 1,a^8` and `a^10` with `agt 0` is __________.

Text Solution

Verified by Experts

`:. AMge GM`
`:.(a^(-5)+a^(-4)+a^(-3)+a^(-3)+a^(-3)+1+a^(8)+a^(10))/(8) ge (a^(-5)*a^(-4)*a^(-3)*a^(-3)*a^(-3)*1*a^(8)*a^(10))^((1)/(8))=(1)^((1)/(8))=1`
`implies (a^(-5)+a^(-4)+3a^(-3)+1+a^(8)+a^(10))/(8) ge 1`
`:. a^(-5)+a^(-4)+3a^(-3)+1+a^(8)+a^(10) ge 8`
`implies " Required minimum value " = 8`.
Promotional Banner

Topper's Solved these Questions

  • SEQUENCES AND SERIES

    ARIHANT MATHS|Exercise Exercise (Subjective Type Questions)|24 Videos
  • PROPERTIES AND SOLUTION OF TRIANGLES

    ARIHANT MATHS|Exercise Exercise (Questions Asked In Previous 13 Years Exam)|21 Videos
  • SETS, RELATIONS AND FUNCTIONS

    ARIHANT MATHS|Exercise Exercise (Questions Asked In Previous 13 Years Exam)|12 Videos

Similar Questions

Explore conceptually related problems

The number of distinct real roots of x^(4) - 4x^(3) + 12 x^(2) + x - 1 = 0 is __________.

The minimum value of the function f(x)=(3 sin x - 4 cos x - 10)(3 sin x + 4 cos x-10) , is

The sum of three numbers in A.P. is -3 and their product is 8. Find the numbers.

The value of the expression sum_(theta =0)^8 1/(1 + tan^3 (10theta)^@) equals

If x is real, then the minimum value of the expression x^2-8x+17 is

Find both the maximum value and the minimum value of 3x^4-8x^3+12x^2-48x+25 on the interval [0,3]

Minimum value of Z=5x+3y subject to 2x+yge10, x+3yge15, xle10, yle8, x,yge0 is :

The sum of three numbers in AP is -3 and their product is 8, then sum of squares of the numbers is

ARIHANT MATHS-SEQUENCES AND SERIES-Exercise (Questions Asked In Previous 13 Years Exam)
  1. Let a1, a2, a3, ,a(11) be real numbers satisfying a1=15 , 27-2a2>0 an...

    Text Solution

    |

  2. Check 2,4,6,8,10 are in A.P or not

    Text Solution

    |

  3. The minimum value of the sum of real numbers a^-5, a^-4, 3a^-3, 1,a^8 ...

    Text Solution

    |

  4. A man saves ₹ 200 in each of the first three months of his servies.In ...

    Text Solution

    |

  5. Let a(n) be the nth term of an AP, if sum(r=1)^(100)a(2r)= alpha " and...

    Text Solution

    |

  6. Let,a1,a2a,a3,…. be in harmonic progression with a1=5 " and " a(20)=25...

    Text Solution

    |

  7. Statement 1: The sum of the series 1""+""(1""+""2""+""4)""+""(4""+""...

    Text Solution

    |

  8. If 100 times the 100 th term of an A.P with non- zero common differenc...

    Text Solution

    |

  9. If x,y,z are in AP and tan^(-1)x,tan^(-1)y,tan^(-1)z are also in AP, ...

    Text Solution

    |

  10. The sum of first 20 terms of the sequence 0.7 ,0.77 , 0.777 …., is

    Text Solution

    |

  11. Let Sn=underset(k=1)overset(4n)Sigma (-1)^((k(k+1))/2)k^2.Then Sn can ...

    Text Solution

    |

  12. A pack contains n cards numbered from 1 to n . Two consecutive numbere...

    Text Solution

    |

  13. If (10)^9+2(11)^1(10)^8 +….+10 (11)^9 = k(10)^9

    Text Solution

    |

  14. Three positive numbers form an increasing GP. If the middle terms in t...

    Text Solution

    |

  15. find the 3rd term in the sequence: an =(-1)n+15n+1

    Text Solution

    |

  16. The sum of first 9 terms of the series (1^(3))/(1)+(1^(3)+2^(3))/(1+3)...

    Text Solution

    |

  17. If m is the A.M. of two distinct real numbers l and n""(""l ,""n"">"...

    Text Solution

    |

  18. Soppose that all the terms of an arithmetic progression (AP) are natur...

    Text Solution

    |

  19. If the 2nd , 5th and 9th terms of a non-constant A.P are in G.P then t...

    Text Solution

    |

  20. If the sum of the first ten terms of the series (1 3/5)^2+(2 2/5)^2+(3...

    Text Solution

    |