2x^2-20=142

Solution for 2x^2-20=142 equation:

Simplifying
2x2 + -20 = 142

Reorder the terms:
-20 + 2x2 = 142

Solving
-20 + 2x2 = 142

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + 2x2 = 142 + 20

Combine like terms: -20 + 20 = 0
0 + 2x2 = 142 + 20
2x2 = 142 + 20

Combine like terms: 142 + 20 = 162
2x2 = 162

Divide each side by '2'.
x2 = 81

Simplifying
x2 = 81

Take the square root of each side:
x = {-9, 9}