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13 September, 05:08

One of the solutions to x2 - 2x - 15 = 0 is x = - 3. What is the other solution?

x = - 5

x = - 1

x = 1

x = 5

+3
Answers (2)
  1. 13 September, 05:16
    0
    If you factor the equation you can see what the solutions are. Two factor a quadratic of the form ax^2+bx+c, find two values which satisfy two conditions ...

    jk=ac=-15 and j+k=b=-2 so j and k must be - 5 and 3 so the factors are:

    (x-5) (x+3)

    So the other solution is x=5
  2. 13 September, 05:21
    0
    The answer is D) X=5 on E2020
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