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  • Question
  • The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find two numbers.


  • Options
  • A. 10 & 12
  • B. 10 & 18
  • C. 12 & -18
  • D. -12 & 18

  • Correct Answer
  • -12 & 18 

    Explanation

    Given, difference of the squares of two numbers is 180.

    k2 - l2 - 180

     

    Also, square of the smaller number is 8 times the larger.

    = l= 8k

     

    Thus, k2 - 8a - 180 = 0

    k2 ? 18k + 10k - 180 = 0

    ?  k(k - 18) + 10(k ? 18) = 0

    = (k + 10)(k ? 18) = 0

    ?  k = -10, 18

     

    Thus, the other number is

    324 - 180 = l2 

     

    ? Numbers are 12, 18 or -12, 18.

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    Numbers problems


    Search Results


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