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21 October, 11:12

7 less than the square of a number

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Answers (2)
  1. 21 October, 11:26
    0
    6. Sister #1 = T+7, Sister #2=T-3

    (T+7) (T-3) = 24

    T2-3T+7T-21=24

    T2+4T-45=0

    (T+9) (T-5) = 0

    T=-9, T=5.

    Tamara can't be - 9 years old so she is 5.
  2. 21 October, 11:41
    0
    The equation would be set up as 7-x or whatever the variable is
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