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Mathematics
Cloe Meadows
28 February, 09:44
Solve for x.
3x2 - 4 = 8
0
+4
0
0
0
+1
Answers (
2
)
Sophie Mckay
28 February, 12:29
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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Lorelei Gallagher
28 February, 13:23
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
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