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5 February, 18:06

Use any method to solve the equation. If necessary, round to the nearest hundredth. 9x^2-21=0

0.65, - 0.65

1.53, - 1.53

3, - 3

4.58, - 4.58

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Answers (1)
  1. 5 February, 21:46
    0
    x = 1.53, - 1.53.

    Step-by-step explanation:

    9x^2 - 21 = 0

    9x^2 = 21

    x^2 = 21/9

    x = + / - √21 / 3

    x = 1.53, - 1.53.
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