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19 December, 01:31

Solve the equation. x2 18x 81 = 25

a. 14, 4

b. - 4, - 14

c. 14, - 14

d. - 4, 4

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Answers (1)
  1. 19 December, 01:53
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    X^2 + 18x + 81 = 25

    x^2 + 18x + 81 - 25 = 0

    x^2 + 18x + 56 = 0

    (x + 4) (x + 14) = 0

    x + 4 = 0 or x + 14 = 0

    x = - 4 or x = - 14
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