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Simplifying
2x2 + 20 = 156
Reorder the terms:
20 + 2x2 = 156
Solving
20 + 2x2 = 156
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 = 156 + -20
Combine like terms: 20 + -20 = 0
0 + 2x2 = 156 + -20
2x2 = 156 + -20
Combine like terms: 156 + -20 = 136
2x2 = 136
Divide each side by '2'.
x2 = 68
Simplifying
x2 = 68
Take the square root of each side:
x = {-8.246211251, 8.246211251}
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