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12 May, 12:30

Two numbers that multiply to equal 405 but add to equal 42

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Answers (2)
  1. 12 May, 12:40
    0
    X*y=405

    x+y=42

    y=405/x

    x+405/x=42

    x^2+405=42x

    x^2-42x+405=0

    (x-27) (x-15) = 0

    x=27

    x=15
  2. 12 May, 16:08
    0
    27 and 15 add up to 42 and when multiplies they have a sum of 405

    simply do trial and error for this type of question, try using factors of the number to find out what can be used to equal the number
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