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24 August, 01:18

Find two integers whose sum is - 7 and whose product is 12. Explain how you found the numbers.

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Answers (2)
  1. 24 August, 03:23
    0
    Hello : let x, y this numbers

    x+y = - 7 ... (1)

    xy = 12 ... (2)

    by (1):

    y = - 7 - x

    subsct in (2):

    x (-7 - x) = 12

    -7x - x² = 12

    x² + 7x + 12 = 0

    (x+4) (x + 3) = 0

    x+4 = 0 or x+3 = 0

    so : x = - 4 or x = - 3
  2. 24 August, 04:54
    0
    -3 + (-4) = - 7

    -3 times - 4=12

    negative plus a negative is still a negative. negative times a negative is a positive.
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