Solve for x.

3x2 - 4 = 8

0

+4

0

0

0

Question

Mathematics

Seamus Campos

25 February, 08:58

Solve for x.

3x2 - 4 = 8

0

+4

0

0

0

+5

Answers (2)

Know the Answer?

Allan Haynes · Answer 1

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

Cindy Lou Who · Answer 2

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

Solve for x.3x2 - 4 = 80+4000

Solve for x.

3x2 - 4 = 8

0

+4

0

0

0