Home
Class 7
MATHS
If x^(2) - y^(2) = 28 and x + y = 7 then...

If `x^(2) - y^(2) = 28` and x + y = 7 then `(x - y)^(2) = "_________"` .

A

8

B

4

C

16

D

12

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • EXPRESSIONS AND SPECIAL PRODUCTS

    PEARSON IIT JEE FOUNDATION|Exercise CONCEPT APPLICATION (LEVEL 2) |19 Videos

  • EQUATIONS AND THEIR APPLICATIONS

    PEARSON IIT JEE FOUNDATION|Exercise Level 3|23 Videos

  • FORMULAE

    PEARSON IIT JEE FOUNDATION|Exercise TEST 2|11 Videos

Similar Questions

Explore conceptually related problems

If x + y = 7 and xy = 2 , then x^*(2) - y^(2) = "_________" (x gt y)

3x^(2)y+7x^(2)y = _____

If x -y = 13 and xy = 28, then find x ^(2) + y ^(2).

x^(2)+y^(2)=51 and x-y=7 ,evaluate xy ."

If x^2+y^2=7 and xy=2 then x^4-2x^2y^2+y^4=

If 2x-y = 7 and x-y = 6, then value of x and y will be

PEARSON IIT JEE FOUNDATION-EXPRESSIONS AND SPECIAL PRODUCTS -CONCEPT APPLICATION (LEVEL 3)
  1. If x^(2) - y^(2) = 28 and x + y = 7 then (x - y)^(2) = "" .

    Text Solution

    |

  2. Factorise a^(4) + a^(3) + a^(2) + a.

    Text Solution

    |

  3. Factorise (2a + 3b)^(2) - (3a - 2b)^(2) .

    Text Solution

    |

  4. What is the remainder when (2x^(2) + 3x + 7) is divided by (x + 2) ?

    Text Solution

    |

  5. What is the quotient when (x^(3) + 8) is divided by (x^(2) - 2x + 4) ?

    Text Solution

    |

  6. Which of the following is a perfect square ?

    Text Solution

    |

  7. If x + y = 7 and xy = 2 , then x^(2) - y^(2) = "" (x gt y)

    Text Solution

    |

  8. 32. If x+1/x=2 then x^100 -1/x^100 is

    Text Solution

    |

  9. If x + (1)/(x) = 2 , then x^(100) - (1)/(x^(100)) = "".

    Text Solution

    |

  10. For what value of p is 9 x^(2) + 18 xy + p a perfect square ?

    Text Solution

    |

  11. If 2y + (1)/(2y) = 3 , then 16y^(4) + (1)/(16y^(4)) = "".

    Text Solution

    |

  12. If 496 xx 492 = x^(2) - 4 (x gt 0) , then x = "".

    Text Solution

    |

  13. Factorise x^(4) + x^(2) + 1 .

    Text Solution

    |

  14. If x + (1)/(x) = a and x - (1)/(x) = b , then a^(2) - b^(2) = "" .

    Text Solution

    |

  15. Factorise y^(2) + 2xy + 2 xz - z^(2) .

    Text Solution

    |

  16. If A = (x - a) (x - b) (x -c) "……" ( x- z) , then the number of terms ...

    Text Solution

    |

  17. (4x^(4) + 19x^(2) + 25) div (2x^(2) - x + 5) = "" .

    Text Solution

    |

  18. If P = 8x^(4) + 6x^(3) - 15 x^(2) + 27 x - 20 and Q = 2x^(2) + 3x - 4 ...

    Text Solution

    |

  19. Factorize: x^(3) + xy^(2) - x^(2) -y^(2) =

    Text Solution

    |

  20. If y - (1)/(y) = 3 , then find y^(4) + (1)/(y^(4)) .

    Text Solution

    |