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25 February, 08:58

Solve for x.

3x2 - 4 = 8

0

+4

0

0

0

+5
Answers (2)
  1. 25 February, 10:15
    0
    x = ±2

    Step-by-step explanation:

    3x^2 - 4 = 8

    Add 4 to each side

    3x^2 - 4+4 = 8+4

    3x^2 = 12

    Divide each side by 3

    3x^2 / 3 = 12/3

    x^2 = 4

    Take the square root of each side

    sqrt (x^2) = ±sqrt (4)

    x = ±2
  2. 25 February, 12:07
    0
    x = 4 or - 4

    Step-by-Step Explanation:

    3x² - 4 = 8

    Add 4 to both sides.

    3x² - 4 + 4 = 8 + 4

    3x² = 12

    Divide 3 to both sides.

    3x²/3 = 12/3

    x² = 4

    Take square root of both sides.

    ±√x² = ±√4

    x = 4 or - 4
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