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13 October, 09:09

What is the value of z so that-9 and 9 are both solutions of x^2+z=103?

A) - 22

B) 3

C) 22

D 184

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Answers (1)
  1. 13 October, 13:09
    0
    If the sol'ns are - 9 and 9, then we can use this to form our eq'n:

    (x - 9) (x + 9) = 0

    x^2 - 81 = 0

    so ...

    x^2 + z - 103 = x^2 - 81

    z - 103 = - 81

    z = - 81 + 103

    z = 22
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