Home
Class 8
MATHS
Find the values of the following express...

Find the values of the following expressions:
(i) `16 x^2+24+9` , when `x=7/4`
(ii) `64 x^2+81 y^2+144 x y` , when `x=11` and `y=4/3`

Text Solution

Verified by Experts

Given:
`(i) 16 x^2+24+9`
`=> 16(7/4)^2+24+9`
`=> 16(49/16)+24+9`
`=> 16(49/16)+24+9`
`=> 49+24+9`
`=>82`
`(ii) 64 x^2+81 y^2+144 x y`
...
Promotional Banner

Topper's Solved these Questions

  • COMPOUND INTEREST

    RD SHARMA|Exercise All Questions|129 Videos

Similar Questions

Explore conceptually related problems

Find the value of the expression 9x^(2)+24x+16, when x=20

Find the value of the expression (9x^(2) + 24 x + 16) , when x = 12

Find the value of the expression (81 x^(2) + 16 y^(2) - 72 xy) when x = (2)/(3) and y = (3)/(4)

Find the value of the expression 25 x^(2) + 9y^(2) + 30 xy . When x = 8 and y = 10.

find the value of the expression (64x^(2) + 81y^(2) + 144 xy) when x = 11 and y = (4)/(3)

Find each of the following products: (i) (4x - 7y) (4x - 7y) (ii) (3x^(2) - 4y^(2)) (3x^(2) - 4y^(2))

If x=1 and y=2, find the values of each of the following algebraic expressions: 3x+2y-7 (ii) x^(2)

Find each of the following products: (i) (4x + 5y) (4x - 5y) (ii) (3x^(2) + 2y^(2)) (3x^(2) - 2y^(2))

Find the value of : (i) x^(3)+y^(3)-12xy+64 , when x+y=-4 (ii) x^(3)-8y^(3)-36xy-216 , when x=2y+6

RD SHARMA-ALGEBRAIC EXPRESSIONS AND IDENTITIES-All Questions
  1. If x-y=7\ a n d\ x y=9, find the value of x^2+y^2

    Text Solution

    |

  2. If 3x+5y=11 and xy=2, find the value of 9x^2+25 y^2

    Text Solution

    |

  3. Find the values of the following expressions: (i) 16 x^2+24+9 , when...

    Text Solution

    |

  4. If x+1/x=9. find the value of x^4+1/(x^4)dot

    Text Solution

    |

  5. If x+1/x=12 , find the value of x-1/xdot

    Text Solution

    |

  6. If 2x+3y=14 a n d 2x-3y=2, find the value of x y [Hint use (2x+3y)^2-...

    Text Solution

    |

  7. If x^2+y^2=29 a n d x y=2, find the value of (i)x+y (ii) x-y

    Text Solution

    |

  8. What must be added to each of the following expressions to make it a...

    Text Solution

    |

  9. Simplify: (i) (x-y)(x+y)x^2+y^2) (x^4+y^4) (ii) (2x-1) (2x+1)(4x^2...

    Text Solution

    |

  10. Simplify: (m^2-n^2m)^2+2m^3n^2

    Text Solution

    |

  11. Show that : (i) (3x+7)^2-84 x=(3x-7)^2 (ii) (9a-5b)^2+180 a b=(9a+...

    Text Solution

    |

  12. Show that : (i) (4p q+3q)^2-(4q p-3q)^2=48 p q^2 (ii) (a-b)(a+b)+(...

    Text Solution

    |

  13. Find the following products: (i) (x+2)(x+3) (ii)(x+7)(x-2) (iii...

    Text Solution

    |

  14. Evaluate the following : (i)107 xx 103 (ii) 56xx 48 (iii) 95 xx97

    Text Solution

    |

  15. Find the following products: (i)(x+4)(x+7) (ii) (x-11)(x+4) (i...

    Text Solution

    |

  16. Find the following products: (i)(y^2-4)(y^2-3) (ii) (x+4/3)(x+3/4) ...

    Text Solution

    |

  17. Find the following products: (i)z^2+2)(z^2-3) (ii) (3x-4y)(2x-4y) ...

    Text Solution

    |

  18. Find the following products: (i)(z+3/4)(z+4/3) (ii) (x^2+4)(x^2+9) ...

    Text Solution

    |

  19. Evaluate the following : (i)102 xx 106 (ii) 109 xx 107 (iii)35 xx...

    Text Solution

    |

  20. Evaluate the following : (i)103 xx 96 (ii) 34 xx 36 (iii) 994 xx ...

    Text Solution

    |