Question

Solve for x. 3x2 -4 = 8 0 +4 0 0 0

Answer 1

Answer:

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

Answer 2

Answer:

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