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16 July, 14:16

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

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  1. 16 July, 14:19
    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. 16 July, 14:31
    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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