3x^2-8-20=0

Solution for 3x^2-8-20=0 equation:

Simplifying
3x2 + -8 + -20 = 0

Reorder the terms:
-8 + -20 + 3x2 = 0

Combine like terms: -8 + -20 = -28
-28 + 3x2 = 0

Solving
-28 + 3x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '28' to each side of the equation.
-28 + 28 + 3x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 3x2 = 0 + 28
3x2 = 0 + 28

Combine like terms: 0 + 28 = 28
3x2 = 28

Divide each side by '3'.
x2 = 9.333333333

Simplifying
x2 = 9.333333333

Take the square root of each side:
x = {-3.055050463, 3.055050463}