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7 December, 05:20

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

+2
Answers (1)
  1. 7 December, 06:33
    0
    The answer is C.

    x^2 + z = 103x^2 + 22 = 103*Subtract both sides by 22*x^2 + 22 - 22 = 103 - 22x^2 = 81*square root both sides to find x*√x^2 = √81

    x = + - 9
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