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4 July, 20:49

Find the solutions to the equation below check all that apply

9x^2-81=0

A. x=9

B. x=1

C. x=-9

D. x=-3

E. x=3

F. x=-81

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Answers (1)
  1. 5 July, 00:19
    0
    9x^2-81=0

    add 81 to each side

    9x^2 = 81

    divide by 9

    x^2 = 9

    take the square root of each side

    x = + - sqrt (9)

    x=+3,-3

    Choices D, E
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