Home
Class 8
MATHS
Evaluate (-8x^2y^6)xx(\ -20 x y) for \ x...

Evaluate `(-8x^2y^6)xx(\ -20 x y) for \ x=2. 5\ a n d\ y=1.`

Text Solution

Verified by Experts

`(-8x^2y^6)xx(\ -20 x y)`
`20xx8xxx^3xxy^7`
`160x^3y^7`
when x=2.5,y=1, then
`160xx(2.5)^3`
`=2500`
Promotional Banner

Topper's Solved these Questions

  • COMPOUND INTEREST

    RD SHARMA|Exercise All Questions|129 Videos

Similar Questions

Explore conceptually related problems

Evaluate : x^2 times ( x/y - y/x ) times ( y/x + x/y ) times y^2

Evaluate : sqrt ( x^5 / y^2 ) times sqrt ( x^6 / ( x^-2 y^-4 ) )

Evaluate : sqrt ( x^5 / y^2 ) times sqrt ( x^6 / ( x^-2 y^-4 ) )

Evaluate: [(x^(5y-5)xx x^(5-2y))/(x^(4y-6)xx x^(2y-9))]^(-(4)/(3))

The equation of the circle having the intercept on the line y+2x=0 by the circle x^2 + y^2 + 4x + 6y = 0 as a diameter is : (A) 5x^2 + 5y^2 - 8x + 16y =0 (B) 5x^2 + 5y^2 + 8x - 16y =0 (C) 5x^2 + 5y^2 - 8x - 16y =0 (D) 5x^2 + 5y^2 + 8x+- 16y =0

Two circles x^(2) + y^(2) - 4x + 10y + 20 = 0 and x^(2) + y^(2) + 8x - 6y - 24= 0

(i) Find the equation of a circle , which is concentric with the circle x^(2) + y^(2) - 6x + 12y + 15 = 0 and of double its radius. (ii) Find the equation of a circle , which is concentric with the circle x^(2) + y^(2) - 2x - 4y + 1 = 0 and whose radius is 5. (iii) Find the equation of the cricle concentric with x^(2) + y^(2) - 4x - 6y - 3 = 0 and which touches the y-axis. (iv) find the equation of a circle passing through the centre of the circle x^(2) + y^(2) + 8x + 10y - 7 = 0 and concentric with the circle 2x^(2) + 2y^(2) - 8x - 12y - 9 = 0 . (v) Find the equation of the circle concentric with the circle x^(2) + y^(2) + 4x - 8y - 6 = 0 and having radius double of its radius.

Find the angle of intersection of the following curves : y^2=xa n dx^2=y y=x^2a n dx^2+y^2=20 2y^2=x^3a n dy^2=32 x x^2+y^2-4x-1=0a n dx^2+y^2-2y-9=0 (x^2)/(a^2)+(y^2)/(b^2)=1a n dx^2+y^2=a b x^2+4y^2=8a n dx^2-2y^2=2 x^2=27ya n dy^2=8x x^2+y^2=2xa n dy^2=x y=4-x^2a n dy=x^2

What are the values of x and y that satisfy the equation2^(0.7x)*3^(-1.25y)=(8sqrt(6))/(27)? a. x=2. 5 , y=6 b. x=3, y=5 c. x=3, y=4 d. x=5, y=2

RD SHARMA-ALGEBRAIC EXPRESSIONS AND IDENTITIES-All Questions
  1. Find the value of (5x^6)xx\ (-1. 5 x^2y^3)xx(-12 x y^2)\ when\ x=1, y...

    Text Solution

    |

  2. E v a l u a t e\ (2. 3 a^5b^2)xx(1. 2 a^2b^2)w h e n\ a=1\ a n d\ b=0....

    Text Solution

    |

  3. Evaluate (-8x^2y^6)xx(\ -20 x y) for \ x=2. 5\ a n d\ y=1.

    Text Solution

    |

  4. Express each of the products as a monomials and verify the result fo...

    Text Solution

    |

  5. find the product of following (2/5a^2b)xx\ (-15 b^2a c)xx\ (-1/2c^2)

    Text Solution

    |

  6. Express each of the products as a monomials (-4/7a^2b)xx(-2/3b^2c)xx...

    Text Solution

    |

  7. Express each of the products as a monomials (4/9a b c^3)xx(-(27)/5a^...

    Text Solution

    |

  8. Evaluate each of the that when x=2, y=-1. (2x y)xx((x^2y)/4)xx(x^2)xx...

    Text Solution

    |

  9. Evaluate each of the that when x=2, y=-1. (3/5x^2y)xx(-(15)/4x y^2)xx...

    Text Solution

    |

  10. Multiply: 2x by (3x+5y)

    Text Solution

    |

  11. Multiply: (7x y+5y) by 3x y

    Text Solution

    |

  12. Multiply: -(3a b^2)/5\ by ((2a)/3-b)

    Text Solution

    |

  13. Find the product of 7/2s^2t\ a n d\ s+tdot Verify the result for s=1/2...

    Text Solution

    |

  14. Multiply: (3x-4/5y^2x)b y1/2x ydot

    Text Solution

    |

  15. Find the following products: (i) 100 x(0. 01 x^4-0. 01 x^2) (ii) 121....

    Text Solution

    |

  16. Determine each of the products and find the value of each for x=2,\...

    Text Solution

    |

  17. Determine each of the products and find the value of each for x=2,\ ...

    Text Solution

    |

  18. Determine each of the products and find the value of each for x=2,\ ...

    Text Solution

    |

  19. Simplify the expressions and evaluate them as directed: (i)

    Text Solution

    |

  20. Add : (i) 5m\ (3-m)a n d\ 6m^2-13 m (ii)4y\ (3y^2+5y-7)a n d\ 2\ (y^...

    Text Solution

    |