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Simplifying
3x2 + -19 = 20
Reorder the terms:
-19 + 3x2 = 20
Solving
-19 + 3x2 = 20
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '19' to each side of the equation.
-19 + 19 + 3x2 = 20 + 19
Combine like terms: -19 + 19 = 0
0 + 3x2 = 20 + 19
3x2 = 20 + 19
Combine like terms: 20 + 19 = 39
3x2 = 39
Divide each side by '3'.
x2 = 13
Simplifying
x2 = 13
Take the square root of each side:
x = {-3.605551275, 3.605551275}
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